18117553125 has 96 divisors (see below), whose sum is σ = 35165249280. Its totient is φ = 8124480000.

The previous prime is 18117553093. The next prime is 18117553127. The reversal of 18117553125 is 52135571181.

It is not a de Polignac number, because 18117553125 - 2⁵ = 18117553093 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18117553127) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3475521 + ... + 3480729.

It is an arithmetic number, because the mean of its divisors is an integer number (366304680).

Almost surely, 2^18117553125 is an apocalyptic number.

18117553125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18117553125 is a deficient number, since it is larger than the sum of its proper divisors (17047696155).

18117553125 is an frugal number, since it uses more digits than its factorization.

18117553125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5297 (or 5277 counting only the distinct ones).

The product of its digits is 42000, while the sum is 39.

The spelling of 18117553125 in words is "eighteen billion, one hundred seventeen million, five hundred fifty-three thousand, one hundred twenty-five".