22661322557 has 2 divisors, whose sum is σ = 22661322558. Its totient is φ = 22661322556.

The previous prime is 22661322533. The next prime is 22661322559. The reversal of 22661322557 is 75522316622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20211171556 + 2450151001 = 142166^2 + 49499^2 .

It is a cyclic number.

It is not a de Polignac number, because 22661322557 - 2¹⁸ = 22661060413 is a prime.

Together with 22661322559, 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 (22661322559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11330661278 + 11330661279.

It is an arithmetic number, because the mean of its divisors is an integer number (11330661279).

Almost surely, 2^22661322557 is an apocalyptic number.

It is an amenable number.

22661322557 is a deficient number, since it is larger than the sum of its proper divisors (1).

22661322557 is an equidigital number, since it uses as much as digits as its factorization.

22661322557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 41.

The spelling of 22661322557 in words is "twenty-two billion, six hundred sixty-one million, three hundred twenty-two thousand, five hundred fifty-seven".