656994942665 has 16 divisors (see below), whose sum is σ = 808600548096. Its totient is φ = 512181600000.

The previous prime is 656994942623. The next prime is 656994942691. The reversal of 656994942665 is 566249499656.

It is not a de Polignac number, because 656994942665 - 2⁶ = 656994942601 is a prime.

It is a super-3 number, since 3×656994942665³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3452336 + ... + 3637665.

It is an arithmetic number, because the mean of its divisors is an integer number (50537534256).

Almost surely, 2^656994942665 is an apocalyptic number.

It is an amenable number.

656994942665 is a deficient number, since it is larger than the sum of its proper divisors (151605605431).

656994942665 is a wasteful number, since it uses less digits than its factorization.

656994942665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7090480.

The product of its digits is 755827200, while the sum is 71.

The spelling of 656994942665 in words is "six hundred fifty-six billion, nine hundred ninety-four million, nine hundred forty-two thousand, six hundred sixty-five".