56431426666 has 16 divisors (see below), whose sum is σ = 85891955400. Its totient is φ = 27801543168.

The previous prime is 56431426663. The next prime is 56431426721. The reversal of 56431426666 is 66662413465.

56431426666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 48971477025 + 7459949641 = 221295^2 + 86371^2 .

It is not an unprimeable number, because it can be changed into a prime (56431426661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44221 + ... + 338848.

Almost surely, 2^56431426666 is an apocalyptic number.

56431426666 is a deficient number, since it is larger than the sum of its proper divisors (29460528734).

56431426666 is a wasteful number, since it uses less digits than its factorization.

56431426666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384153.

The product of its digits is 3732480, while the sum is 49.

The spelling of 56431426666 in words is "fifty-six billion, four hundred thirty-one million, four hundred twenty-six thousand, six hundred sixty-six".