91211662080 has 1296 divisors, whose sum is σ = 410355009792. Its totient is φ = 18170265600.

The previous prime is 91211661979. The next prime is 91211662103. The reversal of 91211662080 is 8026611219.

91211662080 is a `hidden beast` number, since 9 + 1 + 21 + 1 + 6 + 620 + 8 + 0 = 666.

It is a super-2 number, since 2×91211662080² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 852445387 + ... + 852445493.

It is an arithmetic number, because the mean of its divisors is an integer number (316631952).

Almost surely, 2^91211662080 is an apocalyptic number.

91211662080 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91211662080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205177504896).

91211662080 is an abundant number, since it is smaller than the sum of its proper divisors (319143347712).

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

91211662080 is a wasteful number, since it uses less digits than its factorization.

91211662080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 91211662080 in words is "ninety-one billion, two hundred eleven million, six hundred sixty-two thousand, eighty".