656390159 has 4 divisors (see below), whose sum is σ = 656895216. Its totient is φ = 655885104.

The previous prime is 656390129. The next prime is 656390177. The reversal of 656390159 is 951093656.

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 656390159 - 2¹⁶ = 656324623 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 (656390129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250574 + ... + 253179.

It is an arithmetic number, because the mean of its divisors is an integer number (164223804).

Almost surely, 2^656390159 is an apocalyptic number.

656390159 is a deficient number, since it is larger than the sum of its proper divisors (505057).

656390159 is a wasteful number, since it uses less digits than its factorization.

656390159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505056.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 656390159 is about 25620.1123924155. The cubic root of 656390159 is about 869.0685230296.

The spelling of 656390159 in words is "six hundred fifty-six million, three hundred ninety thousand, one hundred fifty-nine".