18520518765 has 64 divisors (see below), whose sum is σ = 34093343232. Its totient is φ = 8409907200.

The previous prime is 18520518763. The next prime is 18520518769. The reversal of 18520518765 is 56781502581.

It is not a de Polignac number, because 18520518765 - 2¹ = 18520518763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520518763) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15681475 + ... + 15682655.

It is an arithmetic number, because the mean of its divisors is an integer number (532708488).

Almost surely, 2^18520518765 is an apocalyptic number.

18520518765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18520518765 is a deficient number, since it is larger than the sum of its proper divisors (15572824467).

18520518765 is a wasteful number, since it uses less digits than its factorization.

18520518765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070.

The product of its (nonzero) digits is 672000, while the sum is 48.

The spelling of 18520518765 in words is "eighteen billion, five hundred twenty million, five hundred eighteen thousand, seven hundred sixty-five".