115521656500 has 24 divisors (see below), whose sum is σ = 252299298888. Its totient is φ = 46208662400.

The previous prime is 115521656473. The next prime is 115521656507. The reversal of 115521656500 is 5656125511.

It can be written as a sum of positive squares in 4 ways, for example, as 164968336 + 115356688164 = 12844^2 + 339642^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 115521656500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115521656507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115521157 + ... + 115522156.

It is an arithmetic number, because the mean of its divisors is an integer number (10512470787).

Almost surely, 2^115521656500 is an apocalyptic number.

115521656500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115521656500 is an abundant number, since it is smaller than the sum of its proper divisors (136777642388).

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

115521656500 is a wasteful number, since it uses less digits than its factorization.

115521656500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231043332 (or 231043320 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 115521656500 in words is "one hundred fifteen billion, five hundred twenty-one million, six hundred fifty-six thousand, five hundred".