56642424664 has 64 divisors (see below), whose sum is σ = 123521760000. Its totient is φ = 23846886528.

The previous prime is 56642424647. The next prime is 56642424703. The reversal of 56642424664 is 46642424665.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5343882 + ... + 5354470.

It is an arithmetic number, because the mean of its divisors is an integer number (1930027500).

Almost surely, 2^56642424664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56642424664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61760880000).

56642424664 is an abundant number, since it is smaller than the sum of its proper divisors (66879335336).

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

56642424664 is a wasteful number, since it uses less digits than its factorization.

56642424664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12280 (or 12276 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 49.

Subtracting from 56642424664 its reverse (46642424665), we obtain a palindrome (9999999999).

The spelling of 56642424664 in words is "fifty-six billion, six hundred forty-two million, four hundred twenty-four thousand, six hundred sixty-four".