22664699492581 has 2 divisors, whose sum is σ = 22664699492582. Its totient is φ = 22664699492580.

The previous prime is 22664699492557. The next prime is 22664699492623. The reversal of 22664699492581 is 18529499646622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19294574568481 + 3370124924100 = 4392559^2 + 1835790^2 .

It is a cyclic number.

It is not a de Polignac number, because 22664699492581 - 2²⁵ = 22664665938149 is a prime.

It is a super-2 number, since 2×22664699492581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22664699492531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11332349746290 + 11332349746291.

It is an arithmetic number, because the mean of its divisors is an integer number (11332349746291).

Almost surely, 2^{22664699492581} is an apocalyptic number.

It is an amenable number.

22664699492581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22664699492581 is an equidigital number, since it uses as much as digits as its factorization.

22664699492581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806215680, while the sum is 73.

The spelling of 22664699492581 in words is "twenty-two trillion, six hundred sixty-four billion, six hundred ninety-nine million, four hundred ninety-two thousand, five hundred eighty-one".