22617421681 has 2 divisors, whose sum is σ = 22617421682. Its totient is φ = 22617421680.

The previous prime is 22617421667. The next prime is 22617421699. The reversal of 22617421681 is 18612471622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22497300081 + 120121600 = 149991^2 + 10960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22617421681 is a prime.

It is a super-2 number, since 2×22617421681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22617421601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11308710840 + 11308710841.

It is an arithmetic number, because the mean of its divisors is an integer number (11308710841).

Almost surely, 2^22617421681 is an apocalyptic number.

It is an amenable number.

22617421681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22617421681 is an equidigital number, since it uses as much as digits as its factorization.

22617421681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The spelling of 22617421681 in words is "twenty-two billion, six hundred seventeen million, four hundred twenty-one thousand, six hundred eighty-one".