22188565840891 has 2 divisors, whose sum is σ = 22188565840892. Its totient is φ = 22188565840890.

The previous prime is 22188565840799. The next prime is 22188565840907. The reversal of 22188565840891 is 19804856588122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22188565840891 - 2¹¹ = 22188565838843 is a prime.

It is not a weakly prime, because it can be changed into another prime (22188565840391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11094282920445 + 11094282920446.

It is an arithmetic number, because the mean of its divisors is an integer number (11094282920446).

Almost surely, 2^{22188565840891} is an apocalyptic number.

22188565840891 is a deficient number, since it is larger than the sum of its proper divisors (1).

22188565840891 is an equidigital number, since it uses as much as digits as its factorization.

22188565840891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88473600, while the sum is 67.

The spelling of 22188565840891 in words is "twenty-two trillion, one hundred eighty-eight billion, five hundred sixty-five million, eight hundred forty thousand, eight hundred ninety-one".