656618980 has 12 divisors (see below), whose sum is σ = 1378899900. Its totient is φ = 262647584.

The previous prime is 656618959. The next prime is 656618981. The reversal of 656618980 is 89816656.

656618980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 81866304 + 574752676 = 9048^2 + 23974^2 .

It is a super-2 number, since 2×656618980² = 862296969792480800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (656618981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16415455 + ... + 16415494.

It is an arithmetic number, because the mean of its divisors is an integer number (114908325).

Almost surely, 2^656618980 is an apocalyptic number.

It is an amenable number.

656618980 is an abundant number, since it is smaller than the sum of its proper divisors (722280920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656618980 is a wasteful number, since it uses less digits than its factorization.

656618980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32830958 (or 32830956 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 656618980 is about 25624.5776550561. The cubic root of 656618980 is about 869.1694985558.

The spelling of 656618980 in words is "six hundred fifty-six million, six hundred eighteen thousand, nine hundred eighty".