115500615561 has 24 divisors (see below), whose sum is σ = 171042052896. Its totient is φ = 75065215680.

The previous prime is 115500615547. The next prime is 115500615617. The reversal of 115500615561 is 165516005511.

It is a happy number.

It is not a de Polignac number, because 115500615561 - 2²¹ = 115498518409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115500615961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84795 + ... + 488048.

It is an arithmetic number, because the mean of its divisors is an integer number (7126752204).

Almost surely, 2^115500615561 is an apocalyptic number.

It is an amenable number.

115500615561 is a deficient number, since it is larger than the sum of its proper divisors (55541437335).

115500615561 is a wasteful number, since it uses less digits than its factorization.

115500615561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573413 (or 573410 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 115500615561 in words is "one hundred fifteen billion, five hundred million, six hundred fifteen thousand, five hundred sixty-one".