656231885 has 4 divisors (see below), whose sum is σ = 787478268. Its totient is φ = 524985504.

The previous prime is 656231867. The next prime is 656231893. The reversal of 656231885 is 588132656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 247464361 + 408767524 = 15731^2 + 20218^2 .

It is a cyclic number.

It is not a de Polignac number, because 656231885 - 2²⁶ = 589123021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 65623184 + ... + 65623193.

It is an arithmetic number, because the mean of its divisors is an integer number (196869567).

Almost surely, 2^656231885 is an apocalyptic number.

It is an amenable number.

656231885 is a deficient number, since it is larger than the sum of its proper divisors (131246383).

656231885 is a wasteful number, since it uses less digits than its factorization.

656231885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131246382.

The product of its digits is 345600, while the sum is 44.

The square root of 656231885 is about 25617.0233438626. The cubic root of 656231885 is about 868.9986651833.

The spelling of 656231885 in words is "six hundred fifty-six million, two hundred thirty-one thousand, eight hundred eighty-five".