18686853503504 has 20 divisors (see below), whose sum is σ = 36291778150380. Its totient is φ = 9321233335680.

The previous prime is 18686853503503. The next prime is 18686853503533. The reversal of 18686853503504 is 40530535868681.

It can be written as a sum of positive squares in 2 ways, for example, as 6069581177104 + 12617272326400 = 2463652^2 + 3552080^2 .

It is a super-2 number, since 2×18686853503504² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18686853503503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387081559 + ... + 1387095030.

It is an arithmetic number, because the mean of its divisors is an integer number (1814588907519).

Almost surely, 2^{18686853503504} is an apocalyptic number.

It is an amenable number.

18686853503504 is a deficient number, since it is larger than the sum of its proper divisors (17604924646876).

18686853503504 is a wasteful number, since it uses less digits than its factorization.

18686853503504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774177018 (or 2774177012 counting only the distinct ones).

The product of its (nonzero) digits is 82944000, while the sum is 62.

The spelling of 18686853503504 in words is "eighteen trillion, six hundred eighty-six billion, eight hundred fifty-three million, five hundred three thousand, five hundred four".