19981977532 has 96 divisors (see below), whose sum is σ = 42326323200. Its totient is φ = 8150688000.

The previous prime is 19981977529. The next prime is 19981977541. The reversal of 19981977532 is 23577918991.

It is a super-2 number, since 2×19981977532² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1277157 + ... + 1292707.

It is an arithmetic number, because the mean of its divisors is an integer number (440899200).

Almost surely, 2^19981977532 is an apocalyptic number.

It is an amenable number.

19981977532 is an abundant number, since it is smaller than the sum of its proper divisors (22344345668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19981977532 is a wasteful number, since it uses less digits than its factorization.

19981977532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15667 (or 15665 counting only the distinct ones).

The product of its digits is 8573040, while the sum is 61.

The spelling of 19981977532 in words is "nineteen billion, nine hundred eighty-one million, nine hundred seventy-seven thousand, five hundred thirty-two".