656651166571 has 2 divisors, whose sum is σ = 656651166572. Its totient is φ = 656651166570.

The previous prime is 656651166487. The next prime is 656651166631. The reversal of 656651166571 is 175661156656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656651166571 - 2²⁵ = 656617612139 is a prime.

It is not a weakly prime, because it can be changed into another prime (656651166671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328325583285 + 328325583286.

It is an arithmetic number, because the mean of its divisors is an integer number (328325583286).

Almost surely, 2^656651166571 is an apocalyptic number.

656651166571 is a deficient number, since it is larger than the sum of its proper divisors (1).

656651166571 is an equidigital number, since it uses as much as digits as its factorization.

656651166571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804000, while the sum is 55.

The spelling of 656651166571 in words is "six hundred fifty-six billion, six hundred fifty-one million, one hundred sixty-six thousand, five hundred seventy-one".