91668916775 has 6 divisors (see below), whose sum is σ = 113669456832. Its totient is φ = 73335133400.

The previous prime is 91668916753. The next prime is 91668916793. The reversal of 91668916775 is 57761986619.

It is not a de Polignac number, because 91668916775 - 2¹² = 91668912679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1833378311 + ... + 1833378360.

It is an arithmetic number, because the mean of its divisors is an integer number (18944909472).

Almost surely, 2^91668916775 is an apocalyptic number.

91668916775 is a deficient number, since it is larger than the sum of its proper divisors (22000540057).

91668916775 is a wasteful number, since it uses less digits than its factorization.

91668916775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666756681 (or 3666756676 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 65.

The spelling of 91668916775 in words is "ninety-one billion, six hundred sixty-eight million, nine hundred sixteen thousand, seven hundred seventy-five".