656215243431 has 8 divisors (see below), whose sum is σ = 954494899584. Its totient is φ = 397706208120.

The previous prime is 656215243421. The next prime is 656215243433. The reversal of 656215243431 is 134342512656.

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

It is not a de Polignac number, because 656215243431 - 2⁷ = 656215243303 is a prime.

It is a super-2 number, since 2×656215243431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656215243433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9942655171 + ... + 9942655236.

It is an arithmetic number, because the mean of its divisors is an integer number (119311862448).

Almost surely, 2^656215243431 is an apocalyptic number.

656215243431 is a deficient number, since it is larger than the sum of its proper divisors (298279656153).

656215243431 is a wasteful number, since it uses less digits than its factorization.

656215243431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19885310421.

The product of its digits is 518400, while the sum is 42.

The spelling of 656215243431 in words is "six hundred fifty-six billion, two hundred fifteen million, two hundred forty-three thousand, four hundred thirty-one".