56650121666 has 16 divisors (see below), whose sum is σ = 90004350744. Its totient is φ = 26649805824.

The previous prime is 56650121597. The next prime is 56650121677. The reversal of 56650121666 is 66612105665.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 54372446041 + 2277675625 = 233179^2 + 47725^2 .

It is a Curzon 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, 181715 + ... + 382518.

Almost surely, 2^56650121666 is an apocalyptic number.

56650121666 is a deficient number, since it is larger than the sum of its proper divisors (33354229078).

56650121666 is a wasteful number, since it uses less digits than its factorization.

56650121666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567205.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 56650121666 in words is "fifty-six billion, six hundred fifty million, one hundred twenty-one thousand, six hundred sixty-six".