22540251691 has 2 divisors, whose sum is σ = 22540251692. Its totient is φ = 22540251690.

The previous prime is 22540251623. The next prime is 22540251731. The reversal of 22540251691 is 19615204522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22540251691 - 2⁹ = 22540251179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22540251691.

It is not a weakly prime, because it can be changed into another prime (22540251611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11270125845 + 11270125846.

It is an arithmetic number, because the mean of its divisors is an integer number (11270125846).

Almost surely, 2^22540251691 is an apocalyptic number.

22540251691 is a deficient number, since it is larger than the sum of its proper divisors (1).

22540251691 is an equidigital number, since it uses as much as digits as its factorization.

22540251691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 22540251691 in words is "twenty-two billion, five hundred forty million, two hundred fifty-one thousand, six hundred ninety-one".