22639791987 has 24 divisors (see below), whose sum is σ = 33031514880. Its totient is φ = 14941280880.

The previous prime is 22639791971. The next prime is 22639791989. The reversal of 22639791987 is 78919793622.

22639791987 is a `hidden beast` number, since 226 + 397 + 9 + 19 + 8 + 7 = 666.

It is not a de Polignac number, because 22639791987 - 2⁴ = 22639791971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22639791989) 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, 1447314 + ... + 1462872.

It is an arithmetic number, because the mean of its divisors is an integer number (1376313120).

Almost surely, 2^22639791987 is an apocalyptic number.

22639791987 is a deficient number, since it is larger than the sum of its proper divisors (10391722893).

22639791987 is a wasteful number, since it uses less digits than its factorization.

22639791987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17183 (or 17180 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The spelling of 22639791987 in words is "twenty-two billion, six hundred thirty-nine million, seven hundred ninety-one thousand, nine hundred eighty-seven".