56661510004 has 12 divisors (see below), whose sum is σ = 108171973728. Its totient is φ = 25755231800.

The previous prime is 56661510001. The next prime is 56661510011. The reversal of 56661510004 is 40001516665.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56661510001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643880752 + ... + 643880839.

It is an arithmetic number, because the mean of its divisors is an integer number (9014331144).

Almost surely, 2^56661510004 is an apocalyptic number.

It is an amenable number.

56661510004 is a deficient number, since it is larger than the sum of its proper divisors (51510463724).

56661510004 is a wasteful number, since it uses less digits than its factorization.

56661510004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287761606 (or 1287761604 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

It can be divided in two parts, 56661 and 510004, that added together give a palindrome (566665).

The spelling of 56661510004 in words is "fifty-six billion, six hundred sixty-one million, five hundred ten thousand, four".