115507501561 has 8 divisors (see below), whose sum is σ = 115745504904. Its totient is φ = 115269728640.

The previous prime is 115507501559. The next prime is 115507501583. The reversal of 115507501561 is 165105705511.

It can be written as a sum of positive squares in 4 ways, for example, as 10041042025 + 105466459536 = 100205^2 + 324756^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 115507501561 - 2¹ = 115507501559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115507501561.

It is not an unprimeable number, because it can be changed into a prime (115507501531) 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, 964575 + ... + 1077691.

It is an arithmetic number, because the mean of its divisors is an integer number (14468188113).

Almost surely, 2^115507501561 is an apocalyptic number.

It is an amenable number.

115507501561 is a deficient number, since it is larger than the sum of its proper divisors (238003343).

115507501561 is a wasteful number, since it uses less digits than its factorization.

115507501561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115211.

The product of its (nonzero) digits is 26250, while the sum is 37.

The spelling of 115507501561 in words is "one hundred fifteen billion, five hundred seven million, five hundred one thousand, five hundred sixty-one".