22515745397 has 2 divisors, whose sum is σ = 22515745398. Its totient is φ = 22515745396.

The previous prime is 22515745381. The next prime is 22515745433. The reversal of 22515745397 is 79354751522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19423718161 + 3092027236 = 139369^2 + 55606^2 .

It is a cyclic number.

It is not a de Polignac number, because 22515745397 - 2⁴ = 22515745381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22515745297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11257872698 + 11257872699.

It is an arithmetic number, because the mean of its divisors is an integer number (11257872699).

Almost surely, 2^22515745397 is an apocalyptic number.

It is an amenable number.

22515745397 is a deficient number, since it is larger than the sum of its proper divisors (1).

22515745397 is an equidigital number, since it uses as much as digits as its factorization.

22515745397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646000, while the sum is 50.

The spelling of 22515745397 in words is "twenty-two billion, five hundred fifteen million, seven hundred forty-five thousand, three hundred ninety-seven".