656671226561 has 16 divisors (see below), whose sum is σ = 762967396224. Its totient is φ = 553524897024.

The previous prime is 656671226543. The next prime is 656671226567. The reversal of 656671226561 is 165622176656.

656671226561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 656671226561 - 2¹⁴ = 656671210177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656671226567) 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, 902450 + ... + 1458683.

It is an arithmetic number, because the mean of its divisors is an integer number (47685462264).

Almost surely, 2^656671226561 is an apocalyptic number.

It is an amenable number.

656671226561 is a deficient number, since it is larger than the sum of its proper divisors (106296169663).

656671226561 is a wasteful number, since it uses less digits than its factorization.

656671226561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361800.

The product of its digits is 5443200, while the sum is 53.

The spelling of 656671226561 in words is "six hundred fifty-six billion, six hundred seventy-one million, two hundred twenty-six thousand, five hundred sixty-one".