6655817857 has 32 divisors (see below), whose sum is σ = 7709022720. Its totient is φ = 5694624000.

The previous prime is 6655817843. The next prime is 6655817897. The reversal of 6655817857 is 7587185566.

It is a de Polignac number, because none of the positive numbers 2^k-6655817857 is a prime.

It is a super-2 number, since 2×6655817857² = 88599822691120144898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6655817807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8862232 + ... + 8862982.

It is an arithmetic number, because the mean of its divisors is an integer number (240906960).

Almost surely, 2^6655817857 is an apocalyptic number.

It is an amenable number.

6655817857 is a deficient number, since it is larger than the sum of its proper divisors (1053204863).

6655817857 is a wasteful number, since it uses less digits than its factorization.

6655817857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513.

The product of its digits is 14112000, while the sum is 58.

The square root of 6655817857 is about 81583.1959229350. The cubic root of 6655817857 is about 1881.0505914001.

The spelling of 6655817857 in words is "six billion, six hundred fifty-five million, eight hundred seventeen thousand, eight hundred fifty-seven".