22557681 has 6 divisors (see below), whose sum is σ = 32583330. Its totient is φ = 15038448.

The previous prime is 22557653. The next prime is 22557683. The reversal of 22557681 is 18675522.

It is a happy number.

22557681 is a `hidden beast` number, since 2 + 2 + 5 + 576 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12215025 + 10342656 = 3495^2 + 3216^2 .

It is not a de Polignac number, because 22557681 - 2⁵ = 22557649 is a prime.

It is a super-2 number, since 2×22557681² = 1017697944195522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22557683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1253196 + ... + 1253213.

It is an arithmetic number, because the mean of its divisors is an integer number (5430555).

Almost surely, 2^22557681 is an apocalyptic number.

It is an amenable number.

22557681 is a deficient number, since it is larger than the sum of its proper divisors (10025649).

22557681 is a wasteful number, since it uses less digits than its factorization.

22557681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506415 (or 2506412 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 22557681 is about 4749.4927097533. The cubic root of 22557681 is about 282.5518468027.

The spelling of 22557681 in words is "twenty-two million, five hundred fifty-seven thousand, six hundred eighty-one".