115661515520 has 144 divisors (see below), whose sum is σ = 296252274528. Its totient is φ = 43111219200.

The previous prime is 115661515517. The next prime is 115661515531. The reversal of 115661515520 is 25515166511.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2171447 + ... + 2224073.

It is an arithmetic number, because the mean of its divisors is an integer number (2057307462).

Almost surely, 2^115661515520 is an apocalyptic number.

115661515520 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 115661515520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148126137264).

115661515520 is an abundant number, since it is smaller than the sum of its proper divisors (180590759008).

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

115661515520 is a wasteful number, since it uses less digits than its factorization.

115661515520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52766 (or 52752 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 38.

The spelling of 115661515520 in words is "one hundred fifteen billion, six hundred sixty-one million, five hundred fifteen thousand, five hundred twenty".