115718817493 has 2 divisors, whose sum is σ = 115718817494. Its totient is φ = 115718817492.

The previous prime is 115718817407. The next prime is 115718817541. The reversal of 115718817493 is 394718817511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101008281124 + 14710536369 = 317818^2 + 121287^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115718817493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115718817293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57859408746 + 57859408747.

It is an arithmetic number, because the mean of its divisors is an integer number (57859408747).

Almost surely, 2^115718817493 is an apocalyptic number.

It is an amenable number.

115718817493 is a deficient number, since it is larger than the sum of its proper divisors (1).

115718817493 is an equidigital number, since it uses as much as digits as its factorization.

115718817493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 55.

The spelling of 115718817493 in words is "one hundred fifteen billion, seven hundred eighteen million, eight hundred seventeen thousand, four hundred ninety-three".