64656081 has 24 divisors (see below), whose sum is σ = 107587584. Its totient is φ = 36650880.

The previous prime is 64656073. The next prime is 64656101. The reversal of 64656081 is 18065646.

64656081 is a `hidden beast` number, since 6 + 46 + 5 + 608 + 1 = 666.

It is not a de Polignac number, because 64656081 - 2³ = 64656073 is a prime.

It is a super-2 number, since 2×64656081² = 8360817620557122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64656041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3961 + ... + 12041.

It is an arithmetic number, because the mean of its divisors is an integer number (4482816).

Almost surely, 2^64656081 is an apocalyptic number.

It is an amenable number.

64656081 is a deficient number, since it is larger than the sum of its proper divisors (42931503).

64656081 is a wasteful number, since it uses less digits than its factorization.

64656081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8221 (or 8218 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 64656081 is about 8040.9005092713. The cubic root of 64656081 is about 401.3621912383.

The spelling of 64656081 in words is "sixty-four million, six hundred fifty-six thousand, eighty-one".