656610979 has 2 divisors, whose sum is σ = 656610980. Its totient is φ = 656610978.

The previous prime is 656610971. The next prime is 656611037. The reversal of 656610979 is 979016656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656610979 - 2³ = 656610971 is a prime.

It is a super-2 number, since 2×656610979² = 862275955486676882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (656610971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328305489 + 328305490.

It is an arithmetic number, because the mean of its divisors is an integer number (328305490).

Almost surely, 2^656610979 is an apocalyptic number.

656610979 is a deficient number, since it is larger than the sum of its proper divisors (1).

656610979 is an equidigital number, since it uses as much as digits as its factorization.

656610979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 49.

The square root of 656610979 is about 25624.4215349342. The cubic root of 656610979 is about 869.1659682215.

The spelling of 656610979 in words is "six hundred fifty-six million, six hundred ten thousand, nine hundred seventy-nine".