656242679 has 4 divisors (see below), whose sum is σ = 672248640. Its totient is φ = 640236720.

The previous prime is 656242649. The next prime is 656242681. The reversal of 656242679 is 976242656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 656242679 - 2⁸ = 656242423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656242649) 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, 8002919 + ... + 8003000.

It is an arithmetic number, because the mean of its divisors is an integer number (168062160).

Almost surely, 2^656242679 is an apocalyptic number.

656242679 is a deficient number, since it is larger than the sum of its proper divisors (16005961).

656242679 is a wasteful number, since it uses less digits than its factorization.

656242679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16005960.

The product of its digits is 1088640, while the sum is 47.

The square root of 656242679 is about 25617.2340232118. The cubic root of 656242679 is about 869.0034297187.

The spelling of 656242679 in words is "six hundred fifty-six million, two hundred forty-two thousand, six hundred seventy-nine".