656042109 has 8 divisors (see below), whose sum is σ = 891227232. Its totient is φ = 429109200.

The previous prime is 656042071. The next prime is 656042113. The reversal of 656042109 is 901240656.

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

It is not a de Polignac number, because 656042109 - 2⁸ = 656041853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656042109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656042159) 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, 2062867 + ... + 2063184.

It is an arithmetic number, because the mean of its divisors is an integer number (111403404).

Almost surely, 2^656042109 is an apocalyptic number.

It is an amenable number.

656042109 is a deficient number, since it is larger than the sum of its proper divisors (235185123).

656042109 is a wasteful number, since it uses less digits than its factorization.

656042109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126107.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 656042109 is about 25613.3189766574. The cubic root of 656042109 is about 868.9148883993.

The spelling of 656042109 in words is "six hundred fifty-six million, forty-two thousand, one hundred nine".