6657142879 has 12 divisors (see below), whose sum is σ = 7268245560. Its totient is φ = 6089282640.

The previous prime is 6657142873. The next prime is 6657142907. The reversal of 6657142879 is 9782417566.

It is not a de Polignac number, because 6657142879 - 2⁹ = 6657142367 is a prime.

It is a super-2 number, since 2×6657142879² = 88635102622840817282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6657142873) 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 11 ways as a sum of consecutive naturals, for example, 307477 + ... + 328414.

It is an arithmetic number, because the mean of its divisors is an integer number (605687130).

Almost surely, 2^6657142879 is an apocalyptic number.

6657142879 is a deficient number, since it is larger than the sum of its proper divisors (611102681).

6657142879 is a wasteful number, since it uses less digits than its factorization.

6657142879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635958 (or 635939 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 55.

The square root of 6657142879 is about 81591.3161984779. The cubic root of 6657142879 is about 1881.1754079187.

The spelling of 6657142879 in words is "six billion, six hundred fifty-seven million, one hundred forty-two thousand, eight hundred seventy-nine".