56686158666 has 32 divisors (see below), whose sum is σ = 126312526080. Its totient is φ = 18843893568.

The previous prime is 56686158647. The next prime is 56686158689. The reversal of 56686158666 is 66685168665.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1410351 + ... + 1449986.

It is an arithmetic number, because the mean of its divisors is an integer number (3947266440).

Almost surely, 2^56686158666 is an apocalyptic number.

56686158666 is an abundant number, since it is smaller than the sum of its proper divisors (69626367414).

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

56686158666 is a wasteful number, since it uses less digits than its factorization.

56686158666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860715 (or 2860709 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 63.

Subtracting 56686158666 from its reverse (66685168665), we obtain a palindrome (9999009999).

The spelling of 56686158666 in words is "fifty-six billion, six hundred eighty-six million, one hundred fifty-eight thousand, six hundred sixty-six".