18989868375 has 24 divisors (see below), whose sum is σ = 34232404752. Its totient is φ = 10127929200.

The previous prime is 18989868371. The next prime is 18989868389. The reversal of 18989868375 is 57386898981.

It is not a de Polignac number, because 18989868375 - 2² = 18989868371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18989868371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8438817 + ... + 8441066.

It is an arithmetic number, because the mean of its divisors is an integer number (1426350198).

Almost surely, 2^18989868375 is an apocalyptic number.

18989868375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18989868375 is a deficient number, since it is larger than the sum of its proper divisors (15242536377).

18989868375 is a wasteful number, since it uses less digits than its factorization.

18989868375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16879904 (or 16879891 counting only the distinct ones).

The product of its digits is 209018880, while the sum is 72.

It can be divided in two parts, 18989 and 868375, that added together give a square (887364 = 942²).

The spelling of 18989868375 in words is "eighteen billion, nine hundred eighty-nine million, eight hundred sixty-eight thousand, three hundred seventy-five".