Declension table of ?ṣaṣṭyadhika

Masculine	Singular	Dual	Plural
Nominative	ṣaṣṭyadhikaḥ	ṣaṣṭyadhikau	ṣaṣṭyadhikāḥ
Vocative	ṣaṣṭyadhika	ṣaṣṭyadhikau	ṣaṣṭyadhikāḥ
Accusative	ṣaṣṭyadhikam	ṣaṣṭyadhikau	ṣaṣṭyadhikān
Instrumental	ṣaṣṭyadhikena	ṣaṣṭyadhikābhyām	ṣaṣṭyadhikaiḥ ṣaṣṭyadhikebhiḥ
Dative	ṣaṣṭyadhikāya	ṣaṣṭyadhikābhyām	ṣaṣṭyadhikebhyaḥ
Ablative	ṣaṣṭyadhikāt	ṣaṣṭyadhikābhyām	ṣaṣṭyadhikebhyaḥ
Genitive	ṣaṣṭyadhikasya	ṣaṣṭyadhikayoḥ	ṣaṣṭyadhikānām
Locative	ṣaṣṭyadhike	ṣaṣṭyadhikayoḥ	ṣaṣṭyadhikeṣu

Compound ṣaṣṭyadhika -

Adverb -ṣaṣṭyadhikam -ṣaṣṭyadhikāt