91751512680 has 48 divisors (see below), whose sum is σ = 298192417380. Its totient is φ = 24467069952.

The previous prime is 91751512679. The next prime is 91751512709. The reversal of 91751512680 is 8621515719.

91751512680 is a `hidden beast` number, since 9 + 1 + 7 + 51 + 512 + 6 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 90277413444 + 1474099236 = 300462^2 + 38394^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127432297 + ... + 127433016.

Almost surely, 2^91751512680 is an apocalyptic number.

91751512680 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91751512680 is an abundant number, since it is smaller than the sum of its proper divisors (206440904700).

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

91751512680 is a wasteful number, since it uses less digits than its factorization.

91751512680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254865330 (or 254865323 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 45.

The spelling of 91751512680 in words is "ninety-one billion, seven hundred fifty-one million, five hundred twelve thousand, six hundred eighty".