6655917857 has 2 divisors, whose sum is σ = 6655917858. Its totient is φ = 6655917856.

The previous prime is 6655917811. The next prime is 6655917869. The reversal of 6655917857 is 7587195566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6546589921 + 109327936 = 80911^2 + 10456^2 .

It is a cyclic number.

It is not a de Polignac number, because 6655917857 - 2²² = 6651723553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6655917796 and 6655917805.

It is not a weakly prime, because it can be changed into another prime (6655917157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3327958928 + 3327958929.

It is an arithmetic number, because the mean of its divisors is an integer number (3327958929).

Almost surely, 2^6655917857 is an apocalyptic number.

It is an amenable number.

6655917857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6655917857 is an equidigital number, since it uses as much as digits as its factorization.

6655917857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876000, while the sum is 59.

The square root of 6655917857 is about 81583.8087919411. The cubic root of 6655917857 is about 1881.0600119362.

The spelling of 6655917857 in words is "six billion, six hundred fifty-five million, nine hundred seventeen thousand, eight hundred fifty-seven".