56664081 has 6 divisors (see below), whose sum is σ = 81848130. Its totient is φ = 37776048.

The previous prime is 56664079. The next prime is 56664089. The reversal of 56664081 is 18046665.

It can be written as a sum of positive squares in only one way, i.e., 47610000 + 9054081 = 6900^2 + 3009^2 .

It is not a de Polignac number, because 56664081 - 2¹ = 56664079 is a prime.

It is a super-2 number, since 2×56664081² = 6421636151149122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56664089) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3147996 + ... + 3148013.

It is an arithmetic number, because the mean of its divisors is an integer number (13641355).

Almost surely, 2^56664081 is an apocalyptic number.

It is an amenable number.

56664081 is a deficient number, since it is larger than the sum of its proper divisors (25184049).

56664081 is a wasteful number, since it uses less digits than its factorization.

56664081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6296015 (or 6296012 counting only the distinct ones).

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

The square root of 56664081 is about 7527.5547822650. The cubic root of 56664081 is about 384.0926086860.

The spelling of 56664081 in words is "fifty-six million, six hundred sixty-four thousand, eighty-one".