56666663983 has 16 divisors (see below), whose sum is σ = 59336934336. Its totient is φ = 54065076480.

The previous prime is 56666663903. The next prime is 56666664001. The reversal of 56666663983 is 38936666665.

It is a happy number.

56666663983 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 56666663983 - 2³³ = 48076729391 is a prime.

It is a super-2 number, since 2×56666663983² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56666663903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406638 + ... + 527908.

It is an arithmetic number, because the mean of its divisors is an integer number (3708558396).

Almost surely, 2^56666663983 is an apocalyptic number.

56666663983 is a deficient number, since it is larger than the sum of its proper divisors (2670270353).

56666663983 is a wasteful number, since it uses less digits than its factorization.

56666663983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121554.

The product of its digits is 151165440, while the sum is 64.

The spelling of 56666663983 in words is "fifty-six billion, six hundred sixty-six million, six hundred sixty-three thousand, nine hundred eighty-three".