115663400981520 has 320 divisors, whose sum is σ = 431370346721280. Its totient is φ = 25044508329984.

The previous prime is 115663400981509. The next prime is 115663400981581. The reversal of 115663400981520 is 25189004366511.

It is a super-2 number, since 2×115663400981520² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 632339517 + ... + 632522403.

It is an arithmetic number, because the mean of its divisors is an integer number (1348032333504).

Almost surely, 2^{115663400981520} is an apocalyptic number.

115663400981520 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 115663400981520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215685173360640).

115663400981520 is an abundant number, since it is smaller than the sum of its proper divisors (315706945739760).

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

115663400981520 is a wasteful number, since it uses less digits than its factorization.

115663400981520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202742 (or 202736 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 115663400981520 in words is "one hundred fifteen trillion, six hundred sixty-three billion, four hundred million, nine hundred eighty-one thousand, five hundred twenty".