18853721716 has 24 divisors (see below), whose sum is σ = 33308992640. Its totient is φ = 9336930912.

The previous prime is 18853721707. The next prime is 18853721737. The reversal of 18853721716 is 61712735881.

It is a self number, because there is not a number n which added to its sum of digits gives 18853721716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1503625 + ... + 1516111.

Almost surely, 2^18853721716 is an apocalyptic number.

It is an amenable number.

18853721716 is a deficient number, since it is larger than the sum of its proper divisors (14455270924).

18853721716 is a wasteful number, since it uses less digits than its factorization.

18853721716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16063 (or 16061 counting only the distinct ones).

The product of its digits is 564480, while the sum is 49.

The spelling of 18853721716 in words is "eighteen billion, eight hundred fifty-three million, seven hundred twenty-one thousand, seven hundred sixteen".