656639655 has 16 divisors (see below), whose sum is σ = 1200712704. Its totient is φ = 300178080.

The previous prime is 656639651. The next prime is 656639693. The reversal of 656639655 is 556936656.

656639655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 656639655 - 2² = 656639651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 656639598 and 656639607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656639651) 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, 3126751 + ... + 3126960.

It is an arithmetic number, because the mean of its divisors is an integer number (75044544).

Almost surely, 2^656639655 is an apocalyptic number.

656639655 is a deficient number, since it is larger than the sum of its proper divisors (544073049).

656639655 is a wasteful number, since it uses less digits than its factorization.

656639655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6253726.

The product of its digits is 4374000, while the sum is 51.

The square root of 656639655 is about 25624.9810731637. The cubic root of 656639655 is about 869.1786209902.

The spelling of 656639655 in words is "six hundred fifty-six million, six hundred thirty-nine thousand, six hundred fifty-five".