656879519 has 2 divisors, whose sum is σ = 656879520. Its totient is φ = 656879518.

The previous prime is 656879501. The next prime is 656879521. The reversal of 656879519 is 915978656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656879519 - 2²⁴ = 640102303 is a prime.

It is a super-2 number, since 2×656879519² = 862981404963342722, which contains 22 as substring.

Together with 656879521, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656879579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328439759 + 328439760.

It is an arithmetic number, because the mean of its divisors is an integer number (328439760).

Almost surely, 2^656879519 is an apocalyptic number.

656879519 is a deficient number, since it is larger than the sum of its proper divisors (1).

656879519 is an equidigital number, since it uses as much as digits as its factorization.

656879519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4082400, while the sum is 56.

The square root of 656879519 is about 25629.6609224547. The cubic root of 656879519 is about 869.2844422366.

The spelling of 656879519 in words is "six hundred fifty-six million, eight hundred seventy-nine thousand, five hundred nineteen".