22565657 has 2 divisors, whose sum is σ = 22565658. Its totient is φ = 22565656.

The previous prime is 22565633. The next prime is 22565659. The reversal of 22565657 is 75656522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11669056 + 10896601 = 3416^2 + 3301^2 .

It is a cyclic number.

It is not a de Polignac number, because 22565657 - 2²⁴ = 5788441 is a prime.

Together with 22565659, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22565657.

It is not a weakly prime, because it can be changed into another prime (22565659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11282828 + 11282829.

It is an arithmetic number, because the mean of its divisors is an integer number (11282829).

Almost surely, 2^22565657 is an apocalyptic number.

It is an amenable number.

22565657 is a deficient number, since it is larger than the sum of its proper divisors (1).

22565657 is an equidigital number, since it uses as much as digits as its factorization.

22565657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126000, while the sum is 38.

The square root of 22565657 is about 4750.3323041657. The cubic root of 22565657 is about 282.5851446695.

The spelling of 22565657 in words is "twenty-two million, five hundred sixty-five thousand, six hundred fifty-seven".