18685033407 has 24 divisors (see below), whose sum is σ = 27117009920. Its totient is φ = 12397957200.

The previous prime is 18685033397. The next prime is 18685033427. The reversal of 18685033407 is 70433058681.

It is not a de Polignac number, because 18685033407 - 2¹⁵ = 18685000639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18685033427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2037282 + ... + 2046432.

Almost surely, 2^18685033407 is an apocalyptic number.

18685033407 is a deficient number, since it is larger than the sum of its proper divisors (8431976513).

18685033407 is a wasteful number, since it uses less digits than its factorization.

18685033407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203 (or 10200 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 18685033407 in words is "eighteen billion, six hundred eighty-five million, thirty-three thousand, four hundred seven".