55565830656857 has 2 divisors, whose sum is σ = 55565830656858. Its totient is φ = 55565830656856.

The previous prime is 55565830656779. The next prime is 55565830656893. The reversal of 55565830656857 is 75865603856555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53469789788416 + 2096040868441 = 7312304^2 + 1447771^2 .

It is a cyclic number.

It is not a de Polignac number, because 55565830656857 - 2⁴⁰ = 54466319029081 is a prime.

It is a super-2 number, since 2×55565830656857² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55565830626857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27782915328428 + 27782915328429.

It is an arithmetic number, because the mean of its divisors is an integer number (27782915328429).

Almost surely, 2^{55565830656857} is an apocalyptic number.

It is an amenable number.

55565830656857 is a deficient number, since it is larger than the sum of its proper divisors (1).

55565830656857 is an equidigital number, since it uses as much as digits as its factorization.

55565830656857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536000000, while the sum is 74.

The spelling of 55565830656857 in words is "fifty-five trillion, five hundred sixty-five billion, eight hundred thirty million, six hundred fifty-six thousand, eight hundred fifty-seven".