56857222309 has 2 divisors, whose sum is σ = 56857222310. Its totient is φ = 56857222308.

The previous prime is 56857222249. The next prime is 56857222319. The reversal of 56857222309 is 90322275865.

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., 52176610084 + 4680612225 = 228422^2 + 68415^2 .

It is a cyclic number.

It is not a de Polignac number, because 56857222309 - 2²⁹ = 56320351397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56857222319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28428611154 + 28428611155.

It is an arithmetic number, because the mean of its divisors is an integer number (28428611155).

Almost surely, 2^56857222309 is an apocalyptic number.

It is an amenable number.

56857222309 is a deficient number, since it is larger than the sum of its proper divisors (1).

56857222309 is an equidigital number, since it uses as much as digits as its factorization.

56857222309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 56857222309 in words is "fifty-six billion, eight hundred fifty-seven million, two hundred twenty-two thousand, three hundred nine".