656540823 has 8 divisors (see below), whose sum is σ = 877264128. Its totient is φ = 436755704.

The previous prime is 656540809. The next prime is 656540827. The reversal of 656540823 is 328045656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656540823 - 2²⁵ = 622986391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656540827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232911 + ... + 235712.

It is an arithmetic number, because the mean of its divisors is an integer number (109658016).

Almost surely, 2^656540823 is an apocalyptic number.

656540823 is a deficient number, since it is larger than the sum of its proper divisors (220723305).

656540823 is a wasteful number, since it uses less digits than its factorization.

656540823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469093.

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 656540823 is about 25623.0525699028. The cubic root of 656540823 is about 869.1350115966.

The spelling of 656540823 in words is "six hundred fifty-six million, five hundred forty thousand, eight hundred twenty-three".