18998121375 has 192 divisors, whose sum is σ = 38343352320. Its totient is φ = 9270936000.

The previous prime is 18998121353. The next prime is 18998121397. The reversal of 18998121375 is 57312189981.

18998121375 is a `hidden beast` number, since 189 + 98 + 1 + 2 + 1 + 375 = 666.

It is an interprime number because it is at equal distance from previous prime (18998121353) and next prime (18998121397).

It is not a de Polignac number, because 18998121375 - 2⁸ = 18998121119 is a prime.

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 191 ways as a sum of consecutive naturals, for example, 37769374 + ... + 37769876.

It is an arithmetic number, because the mean of its divisors is an integer number (199704960).

Almost surely, 2^18998121375 is an apocalyptic number.

18998121375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18998121375 is an abundant number, since it is smaller than the sum of its proper divisors (19345230945).

18998121375 is a wasteful number, since it uses less digits than its factorization.

18998121375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 561 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 54.

The spelling of 18998121375 in words is "eighteen billion, nine hundred ninety-eight million, one hundred twenty-one thousand, three hundred seventy-five".