656642037 has 4 divisors (see below), whose sum is σ = 875522720. Its totient is φ = 437761356.

The previous prime is 656642011. The next prime is 656642039. The reversal of 656642037 is 730246656.

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 de Polignac number, because none of the positive numbers 2^k-656642037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656641986 and 656642004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656642039) 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, 109440337 + ... + 109440342.

It is an arithmetic number, because the mean of its divisors is an integer number (218880680).

Almost surely, 2^656642037 is an apocalyptic number.

It is an amenable number.

656642037 is a deficient number, since it is larger than the sum of its proper divisors (218880683).

656642037 is a wasteful number, since it uses less digits than its factorization.

656642037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218880682.

The product of its (nonzero) digits is 181440, while the sum is 39.

The square root of 656642037 is about 25625.0275512047. The cubic root of 656642037 is about 869.1796719883.

The spelling of 656642037 in words is "six hundred fifty-six million, six hundred forty-two thousand, thirty-seven".