656506013 has 4 divisors (see below), whose sum is σ = 664415808. Its totient is φ = 648596220.

The previous prime is 656506001. The next prime is 656506027. The reversal of 656506013 is 310605656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656506013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656506093) 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, 3954773 + ... + 3954938.

It is an arithmetic number, because the mean of its divisors is an integer number (166103952).

Almost surely, 2^656506013 is an apocalyptic number.

It is an amenable number.

656506013 is a deficient number, since it is larger than the sum of its proper divisors (7909795).

656506013 is an equidigital number, since it uses as much as digits as its factorization.

656506013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7909794.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 656506013 is about 25622.3732897638. The cubic root of 656506013 is about 869.1196507216.

The spelling of 656506013 in words is "six hundred fifty-six million, five hundred six thousand, thirteen".