22557443661 has 6 divisors (see below), whose sum is σ = 32582974190. Its totient is φ = 15038295768.

The previous prime is 22557443653. The next prime is 22557443669. The reversal of 22557443661 is 16634475522.

22557443661 is a `hidden beast` number, since 2 + 2 + 557 + 4 + 4 + 36 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (22557443653) and next prime (22557443669).

It can be written as a sum of positive squares in only one way, i.e., 19270714761 + 3286728900 = 138819^2 + 57330^2 .

It is not a de Polignac number, because 22557443661 - 2³ = 22557443653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22557443669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1253191306 + ... + 1253191323.

Almost surely, 2^22557443661 is an apocalyptic number.

It is an amenable number.

22557443661 is a deficient number, since it is larger than the sum of its proper divisors (10025530529).

22557443661 is a wasteful number, since it uses less digits than its factorization.

22557443661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506382635 (or 2506382632 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 45.

The spelling of 22557443661 in words is "twenty-two billion, five hundred fifty-seven million, four hundred forty-three thousand, six hundred sixty-one".