18713813265 has 128 divisors (see below), whose sum is σ = 42009477120. Its totient is φ = 7701433344.

The previous prime is 18713813227. The next prime is 18713813267. The reversal of 18713813265 is 56231831781.

It is a happy number.

18713813265 is a `hidden beast` number, since 1 + 8 + 7 + 1 + 381 + 3 + 265 = 666.

It is not a de Polignac number, because 18713813265 - 2⁶ = 18713813201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18713813265.

It is not an unprimeable number, because it can be changed into a prime (18713813267) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 344172 + ... + 394818.

It is an arithmetic number, because the mean of its divisors is an integer number (328199040).

Almost surely, 2^18713813265 is an apocalyptic number.

18713813265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18713813265 is an abundant number, since it is smaller than the sum of its proper divisors (23295663855).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18713813265 is a wasteful number, since it uses less digits than its factorization.

18713813265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50708 (or 50702 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 18713813265 in words is "eighteen billion, seven hundred thirteen million, eight hundred thirteen thousand, two hundred sixty-five".