656844452641 has 16 divisors (see below), whose sum is σ = 723905050176. Its totient is φ = 592149128256.

The previous prime is 656844452587. The next prime is 656844452657. The reversal of 656844452641 is 146254448656.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 656844452641 - 2²³ = 656836064033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656844452681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5131566 + ... + 5258008.

It is an arithmetic number, because the mean of its divisors is an integer number (45244065636).

Almost surely, 2^656844452641 is an apocalyptic number.

It is an amenable number.

656844452641 is a deficient number, since it is larger than the sum of its proper divisors (67060597535).

656844452641 is a wasteful number, since it uses less digits than its factorization.

656844452641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135792.

The product of its digits is 22118400, while the sum is 55.

The spelling of 656844452641 in words is "six hundred fifty-six billion, eight hundred forty-four million, four hundred fifty-two thousand, six hundred forty-one".