15115661118 has 12 divisors (see below), whose sum is σ = 32750599128. Its totient is φ = 5038553700.

The previous prime is 15115661089. The next prime is 15115661149. The reversal of 15115661118 is 81116651151.

It is a happy number.

15115661118 is a `hidden beast` number, since 15 + 1 + 15 + 6 + 611 + 18 = 666.

It is a super-2 number, since 2×15115661118² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 419879458 + ... + 419879493.

It is an arithmetic number, because the mean of its divisors is an integer number (2729216594).

Almost surely, 2^15115661118 is an apocalyptic number.

15115661118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15115661118 is an abundant number, since it is smaller than the sum of its proper divisors (17634938010).

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

15115661118 is a wasteful number, since it uses less digits than its factorization.

15115661118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839758959 (or 839758956 counting only the distinct ones).

The product of its digits is 7200, while the sum is 36.

The spelling of 15115661118 in words is "fifteen billion, one hundred fifteen million, six hundred sixty-one thousand, one hundred eighteen".