99871958637 has 128 divisors (see below), whose sum is σ = 166431283200. Its totient is φ = 58687027200.

The previous prime is 99871958621. The next prime is 99871958639. The reversal of 99871958637 is 73685917899.

99871958637 is a `hidden beast` number, since 9 + 9 + 8 + 7 + 1 + 9 + 586 + 37 = 666.

It is not a de Polignac number, because 99871958637 - 2⁴ = 99871958621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99871958639) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 551778687 + ... + 551778867.

It is an arithmetic number, because the mean of its divisors is an integer number (1300244400).

Almost surely, 2^99871958637 is an apocalyptic number.

99871958637 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

99871958637 is the 158013-rd decagonal number.

It is an amenable number.

99871958637 is a deficient number, since it is larger than the sum of its proper divisors (66559324563).

99871958637 is a wasteful number, since it uses less digits than its factorization.

99871958637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 578 counting only the distinct ones).

The product of its digits is 205752960, while the sum is 72.

The spelling of 99871958637 in words is "ninety-nine billion, eight hundred seventy-one million, nine hundred fifty-eight thousand, six hundred thirty-seven".