656580823 has 4 divisors (see below), whose sum is σ = 656746720. Its totient is φ = 656414928.

The previous prime is 656580797. The next prime is 656580829. The reversal of 656580823 is 328085656.

It is a happy number.

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 656580823 - 2⁵ = 656580791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 656580823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656580829) 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, 76863 + ... + 84976.

It is an arithmetic number, because the mean of its divisors is an integer number (164186680).

Almost surely, 2^656580823 is an apocalyptic number.

656580823 is a deficient number, since it is larger than the sum of its proper divisors (165897).

656580823 is a wasteful number, since it uses less digits than its factorization.

656580823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165896.

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 656580823 is about 25623.8331051387. The cubic root of 656580823 is about 869.1526620321.

The spelling of 656580823 in words is "six hundred fifty-six million, five hundred eighty thousand, eight hundred twenty-three".