115721500615597 has 2 divisors, whose sum is σ = 115721500615598. Its totient is φ = 115721500615596.

The previous prime is 115721500615499. The next prime is 115721500615661. The reversal of 115721500615597 is 795516005127511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114048174683556 + 1673325932041 = 10679334^2 + 1293571^2 .

It is an emirp because it is prime and its reverse (795516005127511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115721500615597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115721500613597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57860750307798 + 57860750307799.

It is an arithmetic number, because the mean of its divisors is an integer number (57860750307799).

Almost surely, 2^{115721500615597} is an apocalyptic number.

It is an amenable number.

115721500615597 is a deficient number, since it is larger than the sum of its proper divisors (1).

115721500615597 is an equidigital number, since it uses as much as digits as its factorization.

115721500615597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3307500, while the sum is 55.

The spelling of 115721500615597 in words is "one hundred fifteen trillion, seven hundred twenty-one billion, five hundred million, six hundred fifteen thousand, five hundred ninety-seven".