18931802975 has 12 divisors (see below), whose sum is σ = 23477445264. Its totient is φ = 15144145920.

The previous prime is 18931802891. The next prime is 18931803001. The reversal of 18931802975 is 57920813981.

It is a happy number.

It is not a de Polignac number, because 18931802975 - 2²⁶ = 18864694111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 357407 + ... + 406943.

It is an arithmetic number, because the mean of its divisors is an integer number (1956453772).

Almost surely, 2^18931802975 is an apocalyptic number.

18931802975 is a deficient number, since it is larger than the sum of its proper divisors (4545642289).

18931802975 is a wasteful number, since it uses less digits than its factorization.

18931802975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64834 (or 64829 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 53.

The spelling of 18931802975 in words is "eighteen billion, nine hundred thirty-one million, eight hundred two thousand, nine hundred seventy-five".