656979443 has 2 divisors, whose sum is σ = 656979444. Its totient is φ = 656979442.

The previous prime is 656979431. The next prime is 656979481. The reversal of 656979443 is 344979656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656979443 - 2¹⁰ = 656978419 is a prime.

It is not a weakly prime, because it can be changed into another prime (656979403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328489721 + 328489722.

It is an arithmetic number, because the mean of its divisors is an integer number (328489722).

Almost surely, 2^656979443 is an apocalyptic number.

656979443 is a deficient number, since it is larger than the sum of its proper divisors (1).

656979443 is an equidigital number, since it uses as much as digits as its factorization.

656979443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 53.

The square root of 656979443 is about 25631.6102303386. The cubic root of 656979443 is about 869.3285182921.

The spelling of 656979443 in words is "six hundred fifty-six million, nine hundred seventy-nine thousand, four hundred forty-three".