56661138 has 48 divisors (see below), whose sum is σ = 125643960. Its totient is φ = 18450432.

The previous prime is 56661113. The next prime is 56661151. The reversal of 56661138 is 83116665.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6066369 + 50594769 = 2463^2 + 7113^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180870 + ... + 181182.

Almost surely, 2^56661138 is an apocalyptic number.

56661138 is an abundant number, since it is smaller than the sum of its proper divisors (68982822).

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

56661138 is a wasteful number, since it uses less digits than its factorization.

56661138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 520 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 56661138 is about 7527.3592979212. The cubic root of 56661138 is about 384.0859589466.

The spelling of 56661138 in words is "fifty-six million, six hundred sixty-one thousand, one hundred thirty-eight".