656072643 has 24 divisors (see below), whose sum is σ = 900919488. Its totient is φ = 424586448.

The previous prime is 656072617. The next prime is 656072647. The reversal of 656072643 is 346270656.

It is not a de Polignac number, because 656072643 - 2⁶ = 656072579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656072647) 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, 1254180 + ... + 1254702.

It is an arithmetic number, because the mean of its divisors is an integer number (37538312).

Almost surely, 2^656072643 is an apocalyptic number.

656072643 is a deficient number, since it is larger than the sum of its proper divisors (244846845).

656072643 is an equidigital number, since it uses as much as digits as its factorization.

656072643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 39.

The square root of 656072643 is about 25613.9150267974. The cubic root of 656072643 is about 868.9283687513.

The spelling of 656072643 in words is "six hundred fifty-six million, seventy-two thousand, six hundred forty-three".