656623879 has 2 divisors, whose sum is σ = 656623880. Its totient is φ = 656623878.

The previous prime is 656623871. The next prime is 656623883. The reversal of 656623879 is 978326656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656623879 - 2³ = 656623871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656623871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328311939 + 328311940.

It is an arithmetic number, because the mean of its divisors is an integer number (328311940).

Almost surely, 2^656623879 is an apocalyptic number.

656623879 is a deficient number, since it is larger than the sum of its proper divisors (1).

656623879 is an equidigital number, since it uses as much as digits as its factorization.

656623879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 52.

The square root of 656623879 is about 25624.6732466972. The cubic root of 656623879 is about 869.1716601599.

The spelling of 656623879 in words is "six hundred fifty-six million, six hundred twenty-three thousand, eight hundred seventy-nine".