6649372136 has 16 divisors (see below), whose sum is σ = 13600988640. Its totient is φ = 3022441840.

The previous prime is 6649372091. The next prime is 6649372139. The reversal of 6649372136 is 6312739466.

It is not an unprimeable number, because it can be changed into a prime (6649372139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37780436 + ... + 37780611.

It is an arithmetic number, because the mean of its divisors is an integer number (850061790).

Almost surely, 2^6649372136 is an apocalyptic number.

It is an amenable number.

6649372136 is an abundant number, since it is smaller than the sum of its proper divisors (6951616504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6649372136 is a wasteful number, since it uses less digits than its factorization.

6649372136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75561064 (or 75561060 counting only the distinct ones).

The product of its digits is 979776, while the sum is 47.

The square root of 6649372136 is about 81543.6823794462. The cubic root of 6649372136 is about 1880.4431707612.

The spelling of 6649372136 in words is "six billion, six hundred forty-nine million, three hundred seventy-two thousand, one hundred thirty-six".