656660660601 has 16 divisors (see below), whose sum is σ = 959242115520. Its totient is φ = 396268101120.

The previous prime is 656660660597. The next prime is 656660660609. The reversal of 656660660601 is 106066066656.

It is not a de Polignac number, because 656660660601 - 2² = 656660660597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656660660609) 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, 42693616 + ... + 42708993.

It is an arithmetic number, because the mean of its divisors is an integer number (59952632220).

Almost surely, 2^656660660601 is an apocalyptic number.

It is an amenable number.

656660660601 is a deficient number, since it is larger than the sum of its proper divisors (302581454919).

656660660601 is a wasteful number, since it uses less digits than its factorization.

656660660601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85402856.

The product of its (nonzero) digits is 1399680, while the sum is 48.

It can be divided in two parts, 65 and 6660660601, that added together give a palindrome (6660660666).

The spelling of 656660660601 in words is "six hundred fifty-six billion, six hundred sixty million, six hundred sixty thousand, six hundred one".