656423251 has 16 divisors (see below), whose sum is σ = 736940160. Its totient is φ = 579539520.

The previous prime is 656423239. The next prime is 656423269. The reversal of 656423251 is 152324656.

It is a cyclic number.

It is not a de Polignac number, because 656423251 - 2⁵ = 656423219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656423221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80791 + ... + 88543.

It is an arithmetic number, because the mean of its divisors is an integer number (46058760).

Almost surely, 2^656423251 is an apocalyptic number.

656423251 is a deficient number, since it is larger than the sum of its proper divisors (80516909).

656423251 is a wasteful number, since it uses less digits than its factorization.

656423251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7986.

The product of its digits is 43200, while the sum is 34.

The square root of 656423251 is about 25620.7582050181. The cubic root of 656423251 is about 869.0831275205.

The spelling of 656423251 in words is "six hundred fifty-six million, four hundred twenty-three thousand, two hundred fifty-one".