18503518685 has 16 divisors (see below), whose sum is σ = 22366758960. Its totient is φ = 14694750720.

The previous prime is 18503518679. The next prime is 18503518703. The reversal of 18503518685 is 58681530581.

It can be written as a sum of positive squares in 8 ways, for example, as 4028060089 + 14475458596 = 63467^2 + 120314^2 .

It is not a de Polignac number, because 18503518685 - 2¹⁰ = 18503517661 is a prime.

It is a super-2 number, since 2×18503518685² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 496979 + ... + 532911.

It is an arithmetic number, because the mean of its divisors is an integer number (1397922435).

Almost surely, 2^18503518685 is an apocalyptic number.

It is an amenable number.

18503518685 is a deficient number, since it is larger than the sum of its proper divisors (3863240275).

18503518685 is a wasteful number, since it uses less digits than its factorization.

18503518685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36688.

The product of its (nonzero) digits is 1152000, while the sum is 50.

The spelling of 18503518685 in words is "eighteen billion, five hundred three million, five hundred eighteen thousand, six hundred eighty-five".