15118321818 has 32 divisors (see below), whose sum is σ = 31507652160. Its totient is φ = 4830143360.

The previous prime is 15118321811. The next prime is 15118321849. The reversal of 15118321818 is 81812381151.

It is a super-2 number, since 2×15118321818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15118321811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293268 + ... + 340943.

It is an arithmetic number, because the mean of its divisors is an integer number (984614130).

Almost surely, 2^15118321818 is an apocalyptic number.

15118321818 is an abundant number, since it is smaller than the sum of its proper divisors (16389330342).

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

15118321818 is a wasteful number, since it uses less digits than its factorization.

15118321818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634382.

The product of its digits is 15360, while the sum is 39.

The spelling of 15118321818 in words is "fifteen billion, one hundred eighteen million, three hundred twenty-one thousand, eight hundred eighteen".