656520479 has 4 divisors (see below), whose sum is σ = 660548376. Its totient is φ = 652492584.

The previous prime is 656520419. The next prime is 656520497. The reversal of 656520479 is 974025656.

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 656520479 - 2⁸ = 656520223 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 (656520419) 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, 2013704 + ... + 2014029.

It is an arithmetic number, because the mean of its divisors is an integer number (165137094).

Almost surely, 2^656520479 is an apocalyptic number.

656520479 is a deficient number, since it is larger than the sum of its proper divisors (4027897).

656520479 is a wasteful number, since it uses less digits than its factorization.

656520479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4027896.

The product of its (nonzero) digits is 453600, while the sum is 44.

The square root of 656520479 is about 25622.6555805600. The cubic root of 656520479 is about 869.1260343100.

The spelling of 656520479 in words is "six hundred fifty-six million, five hundred twenty thousand, four hundred seventy-nine".