91366056810 has 640 divisors, whose sum is σ = 310345136640. Its totient is φ = 18811699200.

The previous prime is 91366056799. The next prime is 91366056811. The reversal of 91366056810 is 1865066319.

91366056810 is a `hidden beast` number, since 9 + 1 + 36 + 605 + 6 + 8 + 1 + 0 = 666.

It is a super-2 number, since 2×91366056810² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (91366056811) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 241071201 + ... + 241071579.

It is an arithmetic number, because the mean of its divisors is an integer number (484914276).

Almost surely, 2^91366056810 is an apocalyptic number.

91366056810 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91366056810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155172568320).

91366056810 is an abundant number, since it is smaller than the sum of its proper divisors (218979079830).

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

91366056810 is a wasteful number, since it uses less digits than its factorization.

91366056810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 91366056810 in words is "ninety-one billion, three hundred sixty-six million, fifty-six thousand, eight hundred ten".