91186988426856 has 48 divisors (see below), whose sum is σ = 282245440370400. Its totient is φ = 26053425264672.

The previous prime is 91186988426839. The next prime is 91186988426857. The reversal of 91186988426856 is 65862488968119.

91186988426856 is a `hidden beast` number, since 9 + 1 + 1 + 8 + 69 + 88 + 426 + 8 + 56 = 666.

It is not an unprimeable number, because it can be changed into a prime (91186988426857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90463281666 + ... + 90463282673.

It is an arithmetic number, because the mean of its divisors is an integer number (5880113341050).

Almost surely, 2^{91186988426856} is an apocalyptic number.

It is an amenable number.

91186988426856 is an abundant number, since it is smaller than the sum of its proper divisors (191058451943544).

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

91186988426856 is a wasteful number, since it uses less digits than its factorization.

91186988426856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180926564358 (or 180926564351 counting only the distinct ones).

The product of its digits is 2866544640, while the sum is 81.

The spelling of 91186988426856 in words is "ninety-one trillion, one hundred eighty-six billion, nine hundred eighty-eight million, four hundred twenty-six thousand, eight hundred fifty-six".