6649123188 has 48 divisors (see below), whose sum is σ = 16337401920. Its totient is φ = 2098923264.

The previous prime is 6649123163. The next prime is 6649123189. The reversal of 6649123188 is 8813219466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649123189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 966256 + ... + 973112.

It is an arithmetic number, because the mean of its divisors is an integer number (340362540).

Almost surely, 2^6649123188 is an apocalyptic number.

It is an amenable number.

6649123188 is an abundant number, since it is smaller than the sum of its proper divisors (9688278732).

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

6649123188 is a wasteful number, since it uses less digits than its factorization.

6649123188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11136 (or 11134 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 6649123188 is about 81542.1558949725. The cubic root of 6649123188 is about 1880.4197029611.

The spelling of 6649123188 in words is "six billion, six hundred forty-nine million, one hundred twenty-three thousand, one hundred eighty-eight".