15561500115 has 64 divisors (see below), whose sum is σ = 29092377600. Its totient is φ = 7100029440.

The previous prime is 15561500111. The next prime is 15561500117. The reversal of 15561500115 is 51100516551.

It is not a de Polignac number, because 15561500115 - 2² = 15561500111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15561500111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2935147 + ... + 2940443.

It is an arithmetic number, because the mean of its divisors is an integer number (454568400).

Almost surely, 2^15561500115 is an apocalyptic number.

15561500115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15561500115 is a deficient number, since it is larger than the sum of its proper divisors (13530877485).

15561500115 is an equidigital number, since it uses as much as digits as its factorization.

15561500115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5897 (or 5883 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 30.

The spelling of 15561500115 in words is "fifteen billion, five hundred sixty-one million, five hundred thousand, one hundred fifteen".