91477815064 has 32 divisors (see below), whose sum is σ = 181561842000. Its totient is φ = 43134682752.

The previous prime is 91477815059. The next prime is 91477815067. The reversal of 91477815064 is 46051877419.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91477815067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4574919 + ... + 4594870.

Almost surely, 2^91477815064 is an apocalyptic number.

It is an amenable number.

91477815064 is a deficient number, since it is larger than the sum of its proper divisors (90084026936).

91477815064 is a wasteful number, since it uses less digits than its factorization.

91477815064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9169867 (or 9169863 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 91477815064 in words is "ninety-one billion, four hundred seventy-seven million, eight hundred fifteen thousand, sixty-four".