656138361 has 8 divisors (see below), whose sum is σ = 883870624. Its totient is φ = 432915840.

The previous prime is 656138339. The next prime is 656138363. The reversal of 656138361 is 163831656.

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

It is not a de Polignac number, because 656138361 - 2¹³ = 656130169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656138363) 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, 1127095 + ... + 1127676.

It is an arithmetic number, because the mean of its divisors is an integer number (110483828).

Almost surely, 2^656138361 is an apocalyptic number.

It is an amenable number.

656138361 is a deficient number, since it is larger than the sum of its proper divisors (227732263).

656138361 is a wasteful number, since it uses less digits than its factorization.

656138361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254871.

The product of its digits is 77760, while the sum is 39.

The square root of 656138361 is about 25615.1978520565. The cubic root of 656138361 is about 868.9573809491.

The spelling of 656138361 in words is "six hundred fifty-six million, one hundred thirty-eight thousand, three hundred sixty-one".