6637664385 has 48 divisors (see below), whose sum is σ = 12642963840. Its totient is φ = 3194737920.

The previous prime is 6637664351. The next prime is 6637664389. The reversal of 6637664385 is 5834667366.

It is not a de Polignac number, because 6637664385 - 2¹¹ = 6637662337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6637664389) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18876 + ... + 116754.

It is an arithmetic number, because the mean of its divisors is an integer number (263395080).

Almost surely, 2^6637664385 is an apocalyptic number.

It is an amenable number.

6637664385 is a deficient number, since it is larger than the sum of its proper divisors (6005299455).

6637664385 is a wasteful number, since it uses less digits than its factorization.

6637664385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98038 (or 98035 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 54.

The square root of 6637664385 is about 81471.8625354791. The cubic root of 6637664385 is about 1879.3388712931.

The spelling of 6637664385 in words is "six billion, six hundred thirty-seven million, six hundred sixty-four thousand, three hundred eighty-five".