656556385 has 8 divisors (see below), whose sum is σ = 789383016. Its totient is φ = 524234880.

The previous prime is 656556361. The next prime is 656556389. The reversal of 656556385 is 583655656.

It can be written as a sum of positive squares in 4 ways, for example, as 5234944 + 651321441 = 2288^2 + 25521^2 .

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

It is not a de Polignac number, because 656556385 - 2¹⁵ = 656523617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656556389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123414 + ... + 128623.

It is an arithmetic number, because the mean of its divisors is an integer number (98672877).

Almost surely, 2^656556385 is an apocalyptic number.

It is an amenable number.

656556385 is a deficient number, since it is larger than the sum of its proper divisors (132826631).

656556385 is a wasteful number, since it uses less digits than its factorization.

656556385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252563.

The product of its digits is 3240000, while the sum is 49.

The square root of 656556385 is about 25623.3562399620. The cubic root of 656556385 is about 869.1418785837.

The spelling of 656556385 in words is "six hundred fifty-six million, five hundred fifty-six thousand, three hundred eighty-five".