656610823 has 16 divisors (see below), whose sum is σ = 732395520. Its totient is φ = 583619200.

The previous prime is 656610809. The next prime is 656610827. The reversal of 656610823 is 328016656.

It is a cyclic number.

It is not a de Polignac number, because 656610823 - 2²⁵ = 623056391 is a prime.

It is a super-2 number, since 2×656610823² = 862275545761474658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656610827) 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, 121311 + ... + 126607.

It is an arithmetic number, because the mean of its divisors is an integer number (45774720).

Almost surely, 2^656610823 is an apocalyptic number.

656610823 is a deficient number, since it is larger than the sum of its proper divisors (75784697).

656610823 is a wasteful number, since it uses less digits than its factorization.

656610823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5558.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 656610823 is about 25624.4184909629. The cubic root of 656610823 is about 869.1658993883.

The spelling of 656610823 in words is "six hundred fifty-six million, six hundred ten thousand, eight hundred twenty-three".