656440601 has 16 divisors (see below), whose sum is σ = 707281344. Its totient is φ = 607025664.

The previous prime is 656440583. The next prime is 656440621. The reversal of 656440601 is 106044656.

It is not a de Polignac number, because 656440601 - 2¹⁰ = 656439577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656440621) 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, 380126 + ... + 381848.

It is an arithmetic number, because the mean of its divisors is an integer number (44205084).

Almost surely, 2^656440601 is an apocalyptic number.

It is an amenable number.

656440601 is a deficient number, since it is larger than the sum of its proper divisors (50840743).

656440601 is a wasteful number, since it uses less digits than its factorization.

656440601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 656440601 is about 25621.0967954145. The cubic root of 656440601 is about 869.0907843991.

The spelling of 656440601 in words is "six hundred fifty-six million, four hundred forty thousand, six hundred one".