18857497285 has 12 divisors (see below), whose sum is σ = 24873195564. Its totient is φ = 13714543040.

The previous prime is 18857497279. The next prime is 18857497297. The reversal of 18857497285 is 58279475881.

It can be written as a sum of positive squares in 2 ways, for example, as 3943714401 + 14913782884 = 62799^2 + 122122^2 .

It is not a de Polignac number, because 18857497285 - 2³³ = 10267562693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 15584104 + ... + 15585313.

It is an arithmetic number, because the mean of its divisors is an integer number (2072766297).

Almost surely, 2^18857497285 is an apocalyptic number.

It is an amenable number.

18857497285 is a deficient number, since it is larger than the sum of its proper divisors (6015698279).

18857497285 is a wasteful number, since it uses less digits than its factorization.

18857497285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31169444 (or 31169433 counting only the distinct ones).

The product of its digits is 45158400, while the sum is 64.

The spelling of 18857497285 in words is "eighteen billion, eight hundred fifty-seven million, four hundred ninety-seven thousand, two hundred eighty-five".