91772404465 has 16 divisors (see below), whose sum is σ = 125865260928. Its totient is φ = 62926667136.

The previous prime is 91772404447. The next prime is 91772404483. The reversal of 91772404465 is 56440427719.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91772404447) and next prime (91772404483).

It is a cyclic number.

It is not a de Polignac number, because 91772404465 - 2⁷ = 91772404337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 894714 + ... + 991996.

It is an arithmetic number, because the mean of its divisors is an integer number (7866578808).

Almost surely, 2^91772404465 is an apocalyptic number.

It is an amenable number.

91772404465 is a deficient number, since it is larger than the sum of its proper divisors (34092856463).

91772404465 is a wasteful number, since it uses less digits than its factorization.

91772404465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124248.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 91772404465 in words is "ninety-one billion, seven hundred seventy-two million, four hundred four thousand, four hundred sixty-five".