56686479668 has 144 divisors (see below), whose sum is σ = 131816417040. Its totient is φ = 21069103104.

The previous prime is 56686479653. The next prime is 56686479679. The reversal of 56686479668 is 86697468665.

It can be written as a sum of positive squares in 8 ways, for example, as 2657196304 + 54029283364 = 51548^2 + 232442^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43705196 + ... + 43706492.

It is an arithmetic number, because the mean of its divisors is an integer number (915391785).

Almost surely, 2^56686479668 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 56686479668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65908208520).

56686479668 is an abundant number, since it is smaller than the sum of its proper divisors (75129937372).

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

56686479668 is a wasteful number, since it uses less digits than its factorization.

56686479668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354 (or 2345 counting only the distinct ones).

The product of its digits is 627056640, while the sum is 71.

The spelling of 56686479668 in words is "fifty-six billion, six hundred eighty-six million, four hundred seventy-nine thousand, six hundred sixty-eight".