11515106561500 has 96 divisors (see below), whose sum is σ = 26631361987776. Its totient is φ = 4334607820800.

The previous prime is 11515106561471. The next prime is 11515106561503. The reversal of 11515106561500 is 516560151511.

11515106561500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 11515106561500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11515106561503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79853464 + ... + 79997536.

It is an arithmetic number, because the mean of its divisors is an integer number (277410020706).

Almost surely, 2^{11515106561500} is an apocalyptic number.

11515106561500 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 11515106561500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13315680993888).

11515106561500 is an abundant number, since it is smaller than the sum of its proper divisors (15116255426276).

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

11515106561500 is a wasteful number, since it uses less digits than its factorization.

11515106561500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153512 (or 153500 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 37.

The spelling of 11515106561500 in words is "eleven trillion, five hundred fifteen billion, one hundred six million, five hundred sixty-one thousand, five hundred".