18028765312815 has 32 divisors (see below), whose sum is σ = 30817433905920. Its totient is φ = 8973311618304.

The previous prime is 18028765312769. The next prime is 18028765312847. The reversal of 18028765312815 is 51821356782081.

It is not a de Polignac number, because 18028765312815 - 2¹¹ = 18028765310767 is a prime.

It is a super-2 number, since 2×18028765312815² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 472061694 + ... + 472099883.

It is an arithmetic number, because the mean of its divisors is an integer number (963044809560).

Almost surely, 2^{18028765312815} is an apocalyptic number.

18028765312815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18028765312815 is a deficient number, since it is larger than the sum of its proper divisors (12788668593105).

18028765312815 is a wasteful number, since it uses less digits than its factorization.

18028765312815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944161671.

The product of its (nonzero) digits is 6451200, while the sum is 57.

The spelling of 18028765312815 in words is "eighteen trillion, twenty-eight billion, seven hundred sixty-five million, three hundred twelve thousand, eight hundred fifteen".