656212631643 has 24 divisors (see below), whose sum is σ = 953289559040. Its totient is φ = 434975229360.

The previous prime is 656212631497. The next prime is 656212631653. The reversal of 656212631643 is 346136212656.

656212631643 is a `hidden beast` number, since 6 + 5 + 6 + 2 + 1 + 2 + 631 + 6 + 4 + 3 = 666.

It is not a de Polignac number, because 656212631643 - 2⁸ = 656212631387 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656212631653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1426098 + ... + 1829256.

Almost surely, 2^656212631643 is an apocalyptic number.

656212631643 is a deficient number, since it is larger than the sum of its proper divisors (297076927397).

656212631643 is a wasteful number, since it uses less digits than its factorization.

656212631643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404199 (or 404196 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The spelling of 656212631643 in words is "six hundred fifty-six billion, two hundred twelve million, six hundred thirty-one thousand, six hundred forty-three".