115721500615601 has 8 divisors (see below), whose sum is σ = 118058247596520. Its totient is φ = 113390432243712.

The previous prime is 115721500615597. The next prime is 115721500615661. The reversal of 115721500615601 is 106516005127511.

It can be written as a sum of positive squares in 4 ways, for example, as 502766083600 + 115218734532001 = 709060^2 + 10733999^2 .

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 115721500615601 - 2² = 115721500615597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (115721500615661) 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, 1419611090 + ... + 1419692603.

It is an arithmetic number, because the mean of its divisors is an integer number (14757280949565).

Almost surely, 2^{115721500615601} is an apocalyptic number.

It is an amenable number.

115721500615601 is a deficient number, since it is larger than the sum of its proper divisors (2336746980919).

115721500615601 is an equidigital number, since it uses as much as digits as its factorization.

115721500615601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839304515.

The product of its (nonzero) digits is 63000, while the sum is 41.

The spelling of 115721500615601 in words is "one hundred fifteen trillion, seven hundred twenty-one billion, five hundred million, six hundred fifteen thousand, six hundred one".