18721166988588 has 24 divisors (see below), whose sum is σ = 43688271615408. Its totient is φ = 6239596333056.

The previous prime is 18721166988571. The next prime is 18721166988649. The reversal of 18721166988588 is 88588966112781.

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 7 ways as a sum of consecutive naturals, for example, 98984481 + ... + 99173432.

It is an arithmetic number, because the mean of its divisors is an integer number (1820344650642).

Almost surely, 2^{18721166988588} is an apocalyptic number.

It is an amenable number.

18721166988588 is an abundant number, since it is smaller than the sum of its proper divisors (24967104626820).

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

18721166988588 is a wasteful number, since it uses less digits than its factorization.

18721166988588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198165793 (or 198165791 counting only the distinct ones).

The product of its digits is 743178240, while the sum is 78.

The spelling of 18721166988588 in words is "eighteen trillion, seven hundred twenty-one billion, one hundred sixty-six million, nine hundred eighty-eight thousand, five hundred eighty-eight".