86556681 has 20 divisors (see below), whose sum is σ = 133475584. Its totient is φ = 55841400.

The previous prime is 86556629. The next prime is 86556713. The reversal of 86556681 is 18665568.

86556681 is a `hidden beast` number, since 8 + 6 + 5 + 566 + 81 = 666.

It is not a de Polignac number, because 86556681 - 2¹⁷ = 86425609 is a prime.

It is a super-2 number, since 2×86556681² = 14984118051471522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86556181) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14725 + ... + 19746.

Almost surely, 2^86556681 is an apocalyptic number.

86556681 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

86556681 is a deficient number, since it is larger than the sum of its proper divisors (46918903).

86556681 is a wasteful number, since it uses less digits than its factorization.

86556681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34514 (or 34505 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 86556681 is about 9303.5843092864. The cubic root of 86556681 is about 442.3508488990.

The spelling of 86556681 in words is "eighty-six million, five hundred fifty-six thousand, six hundred eighty-one".