129915514818 has 64 divisors (see below), whose sum is σ = 293602458240. Its totient is φ = 42570792000.

The previous prime is 129915514801. The next prime is 129915514907. The reversal of 129915514818 is 818415519921.

129915514818 is a `hidden beast` number, since 1 + 2 + 9 + 9 + 1 + 551 + 4 + 81 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6251521 + ... + 6272267.

It is an arithmetic number, because the mean of its divisors is an integer number (4587538410).

Almost surely, 2^129915514818 is an apocalyptic number.

129915514818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129915514818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146801229120).

129915514818 is an abundant number, since it is smaller than the sum of its proper divisors (163686943422).

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

129915514818 is a wasteful number, since it uses less digits than its factorization.

129915514818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22720 (or 22714 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 54.

The spelling of 129915514818 in words is "one hundred twenty-nine billion, nine hundred fifteen million, five hundred fourteen thousand, eight hundred eighteen".