91055478856 has 32 divisors (see below), whose sum is σ = 184571928000. Its totient is φ = 41965822656.

The previous prime is 91055478823. The next prime is 91055478883. The reversal of 91055478856 is 65887455019.

It is a happy number.

It is a super-2 number, since 2×91055478856² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 91055478856.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8089636 + ... + 8100883.

It is an arithmetic number, because the mean of its divisors is an integer number (5767872750).

Almost surely, 2^91055478856 is an apocalyptic number.

It is an amenable number.

91055478856 is an abundant number, since it is smaller than the sum of its proper divisors (93516449144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91055478856 is a wasteful number, since it uses less digits than its factorization.

91055478856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16190581 (or 16190577 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 58.

The spelling of 91055478856 in words is "ninety-one billion, fifty-five million, four hundred seventy-eight thousand, eight hundred fifty-six".