22655681 has 2 divisors, whose sum is σ = 22655682. Its totient is φ = 22655680.

The previous prime is 22655671. The next prime is 22655693. The reversal of 22655681 is 18655622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 4165681 = 4300^2 + 2041^2 .

It is a cyclic number.

It is not a de Polignac number, because 22655681 - 2⁶ = 22655617 is a prime.

It is a super-2 number, since 2×22655681² = 1026559763147522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22655651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11327840 + 11327841.

It is an arithmetic number, because the mean of its divisors is an integer number (11327841).

Almost surely, 2^22655681 is an apocalyptic number.

It is an amenable number.

22655681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22655681 is an equidigital number, since it uses as much as digits as its factorization.

22655681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The square root of 22655681 is about 4759.7984201014. The cubic root of 22655681 is about 282.9604301495.

The spelling of 22655681 in words is "twenty-two million, six hundred fifty-five thousand, six hundred eighty-one".