22471981857 has 24 divisors (see below), whose sum is σ = 35901191144. Its totient is φ = 13455154944.

The previous prime is 22471981813. The next prime is 22471981867. The reversal of 22471981857 is 75818917422.

22471981857 is a `hidden beast` number, since 2 + 2 + 471 + 98 + 1 + 85 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 77158656 + 22394823201 = 8784^2 + 149649^2 .

It is not a de Polignac number, because 22471981857 - 2⁷ = 22471981729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22471981867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2591188 + ... + 2599845.

Almost surely, 2^22471981857 is an apocalyptic number.

It is an amenable number.

22471981857 is a deficient number, since it is larger than the sum of its proper divisors (13429209287).

22471981857 is a wasteful number, since it uses less digits than its factorization.

22471981857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5191089 (or 5191086 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The spelling of 22471981857 in words is "twenty-two billion, four hundred seventy-one million, nine hundred eighty-one thousand, eight hundred fifty-seven".