115915691520 has 400 divisors, whose sum is σ = 416457505728. Its totient is φ = 30815354880.

The previous prime is 115915691503. The next prime is 115915691531. The reversal of 115915691520 is 25196519511.

115915691520 is a `hidden beast` number, since 1 + 1 + 59 + 1 + 569 + 15 + 20 = 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 89371512 + ... + 89372808.

Almost surely, 2^115915691520 is an apocalyptic number.

115915691520 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 115915691520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208228752864).

115915691520 is an abundant number, since it is smaller than the sum of its proper divisors (300541814208).

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

115915691520 is an equidigital number, since it uses as much as digits as its factorization.

115915691520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1763 (or 1738 counting only the distinct ones).

The product of its (nonzero) digits is 121500, while the sum is 45.

The spelling of 115915691520 in words is "one hundred fifteen billion, nine hundred fifteen million, six hundred ninety-one thousand, five hundred twenty".