22691564557 has 2 divisors, whose sum is σ = 22691564558. Its totient is φ = 22691564556.

The previous prime is 22691564459. The next prime is 22691564561. The reversal of 22691564557 is 75546519622.

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., 18610143561 + 4081420996 = 136419^2 + 63886^2 .

It is a cyclic number.

It is not a de Polignac number, because 22691564557 - 2¹⁹ = 22691040269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22691504557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11345782278 + 11345782279.

It is an arithmetic number, because the mean of its divisors is an integer number (11345782279).

Almost surely, 2^22691564557 is an apocalyptic number.

It is an amenable number.

22691564557 is a deficient number, since it is larger than the sum of its proper divisors (1).

22691564557 is an equidigital number, since it uses as much as digits as its factorization.

22691564557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536000, while the sum is 52.

The spelling of 22691564557 in words is "twenty-two billion, six hundred ninety-one million, five hundred sixty-four thousand, five hundred fifty-seven".