129912491520 has 400 divisors, whose sum is σ = 531783651168. Its totient is φ = 29693952000.

The previous prime is 129912491509. The next prime is 129912491557. The reversal of 129912491520 is 25194219921.

129912491520 is a `hidden beast` number, since 1 + 29 + 9 + 12 + 4 + 91 + 520 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1406770 + ... + 1496270.

Almost surely, 2^129912491520 is an apocalyptic number.

129912491520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129912491520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265891825584).

129912491520 is an abundant number, since it is smaller than the sum of its proper divisors (401871159648).

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

129912491520 is an frugal number, since it uses more digits than its factorization.

129912491520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89543 (or 89518 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 129912491520 in words is "one hundred twenty-nine billion, nine hundred twelve million, four hundred ninety-one thousand, five hundred twenty".