88681508721 has 160 divisors (see below), whose sum is σ = 150537784320. Its totient is φ = 51663868416.

The previous prime is 88681508701. The next prime is 88681508723. The reversal of 88681508721 is 12780518688.

88681508721 is a `hidden beast` number, since 8 + 8 + 68 + 1 + 508 + 72 + 1 = 666.

It is not a de Polignac number, because 88681508721 - 2¹¹ = 88681506673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (88681508723) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 397674816 + ... + 397675038.

It is an arithmetic number, because the mean of its divisors is an integer number (940861152).

Almost surely, 2^88681508721 is an apocalyptic number.

88681508721 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

88681508721 is a deficient number, since it is larger than the sum of its proper divisors (61856275599).

88681508721 is a wasteful number, since it uses less digits than its factorization.

88681508721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 54.

The spelling of 88681508721 in words is "eighty-eight billion, six hundred eighty-one million, five hundred eight thousand, seven hundred twenty-one".