6661923688 has 64 divisors (see below), whose sum is σ = 15772527360. Its totient is φ = 2570320896.

The previous prime is 6661923677. The next prime is 6661923691. The reversal of 6661923688 is 8863291666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130231 + ... + 174022.

It is an arithmetic number, because the mean of its divisors is an integer number (246445740).

Almost surely, 2^6661923688 is an apocalyptic number.

6661923688 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6661923688 is an abundant number, since it is smaller than the sum of its proper divisors (9110603672).

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

6661923688 is a wasteful number, since it uses less digits than its factorization.

6661923688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304306 (or 304302 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 55.

The square root of 6661923688 is about 81620.6082310099. The cubic root of 6661923688 is about 1881.6256204922.

The spelling of 6661923688 in words is "six billion, six hundred sixty-one million, nine hundred twenty-three thousand, six hundred eighty-eight".