55168709 has 2 divisors, whose sum is σ = 55168710. Its totient is φ = 55168708.

The previous prime is 55168679. The next prime is 55168727. The reversal of 55168709 is 90786155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46036225 + 9132484 = 6785^2 + 3022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55168709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55168769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27584354 + 27584355.

It is an arithmetic number, because the mean of its divisors is an integer number (27584355).

Almost surely, 2^55168709 is an apocalyptic number.

It is an amenable number.

55168709 is a deficient number, since it is larger than the sum of its proper divisors (1).

55168709 is an equidigital number, since it uses as much as digits as its factorization.

55168709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 55168709 is about 7427.5641363774. The cubic root of 55168709 is about 380.6836929900.

The spelling of 55168709 in words is "fifty-five million, one hundred sixty-eight thousand, seven hundred nine".