56666666686 has 16 divisors (see below), whose sum is σ = 98511068160. Its totient is φ = 23943661560.

The previous prime is 56666666671. The next prime is 56666666747. The reversal of 56666666686 is 68666666665.

It is a super-2 number, since 2×56666666686² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28503366 + ... + 28505353.

It is an arithmetic number, because the mean of its divisors is an integer number (6156941760).

Almost surely, 2^56666666686 is an apocalyptic number.

56666666686 is a deficient number, since it is larger than the sum of its proper divisors (41844401474).

56666666686 is a wasteful number, since it uses less digits than its factorization.

56666666686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57008799.

The product of its digits is 403107840, while the sum is 67.

The spelling of 56666666686 in words is "fifty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred eighty-six".