6621688879 has 24 divisors (see below), whose sum is σ = 7563960960. Its totient is φ = 5778088992.

The previous prime is 6621688873. The next prime is 6621688903. The reversal of 6621688879 is 9788861266.

It is not a de Polignac number, because 6621688879 - 2⁵ = 6621688847 is a prime.

It is a super-2 number, since 2×6621688879² = 87693527220544553282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621688873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1677382 + ... + 1681324.

It is an arithmetic number, because the mean of its divisors is an integer number (315165040).

Almost surely, 2^6621688879 is an apocalyptic number.

6621688879 is a deficient number, since it is larger than the sum of its proper divisors (942272081).

6621688879 is a wasteful number, since it uses less digits than its factorization.

6621688879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4511 (or 4498 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 61.

The square root of 6621688879 is about 81373.7603837994. The cubic root of 6621688879 is about 1877.8299314684.

The spelling of 6621688879 in words is "six billion, six hundred twenty-one million, six hundred eighty-eight thousand, eight hundred seventy-nine".