55565117 has 2 divisors, whose sum is σ = 55565118. Its totient is φ = 55565116.

The previous prime is 55565099. The next prime is 55565119. The reversal of 55565117 is 71156555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35593156 + 19971961 = 5966^2 + 4469^2 .

It is a cyclic number.

It is not a de Polignac number, because 55565117 - 2²⁰ = 54516541 is a prime.

Together with 55565119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55565119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27782558 + 27782559.

It is an arithmetic number, because the mean of its divisors is an integer number (27782559).

Almost surely, 2^55565117 is an apocalyptic number.

It is an amenable number.

55565117 is a deficient number, since it is larger than the sum of its proper divisors (1).

55565117 is an equidigital number, since it uses as much as digits as its factorization.

55565117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26250, while the sum is 35.

The square root of 55565117 is about 7454.2012985967. The cubic root of 55565117 is about 381.5933031720.

The spelling of 55565117 in words is "fifty-five million, five hundred sixty-five thousand, one hundred seventeen".