656445855 has 48 divisors (see below), whose sum is σ = 1146839040. Its totient is φ = 320471424.

The previous prime is 656445841. The next prime is 656445931. The reversal of 656445855 is 558544656.

It is not a de Polignac number, because 656445855 - 2¹⁸ = 656183711 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 320926 + ... + 322964.

It is an arithmetic number, because the mean of its divisors is an integer number (23892480).

Almost surely, 2^656445855 is an apocalyptic number.

656445855 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

656445855 is a deficient number, since it is larger than the sum of its proper divisors (490393185).

656445855 is a wasteful number, since it uses less digits than its factorization.

656445855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200 (or 2187 counting only the distinct ones).

The product of its digits is 2880000, while the sum is 48.

The square root of 656445855 is about 25621.1993279003. The cubic root of 656445855 is about 869.0931030607.

The spelling of 656445855 in words is "six hundred fifty-six million, four hundred forty-five thousand, eight hundred fifty-five".