6396556959 has 20 divisors (see below), whose sum is σ = 10290379176. Its totient is φ = 3936342096.

The previous prime is 6396556879. The next prime is 6396556973. The reversal of 6396556959 is 9596556936.

6396556959 is a `hidden beast` number, since 6 + 3 + 9 + 65 + 569 + 5 + 9 = 666.

It is not a de Polignac number, because 6396556959 - 2¹⁵ = 6396524191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6396556896 and 6396556905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6396556259) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3036249 + ... + 3038354.

Almost surely, 2^6396556959 is an apocalyptic number.

6396556959 is a deficient number, since it is larger than the sum of its proper divisors (3893822217).

6396556959 is a wasteful number, since it uses less digits than its factorization.

6396556959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6074628 (or 6074619 counting only the distinct ones).

The product of its digits is 59049000, while the sum is 63.

The square root of 6396556959 is about 79978.4780987986. The cubic root of 6396556959 is about 1856.3025324588.

The spelling of 6396556959 in words is "six billion, three hundred ninety-six million, five hundred fifty-six thousand, nine hundred fifty-nine".