115911163217 has 4 divisors (see below), whose sum is σ = 119043897396. Its totient is φ = 112778429040.

The previous prime is 115911163201. The next prime is 115911163259. The reversal of 115911163217 is 712361119511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712361119511 = 73561 ⋅9683951.

It can be written as a sum of positive squares in 2 ways, for example, as 87743918656 + 28167244561 = 296216^2 + 167831^2 .

It is a cyclic number.

It is not a de Polignac number, because 115911163217 - 2⁴ = 115911163201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115911160217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1566367034 + ... + 1566367107.

It is an arithmetic number, because the mean of its divisors is an integer number (29760974349).

Almost surely, 2^115911163217 is an apocalyptic number.

It is an amenable number.

115911163217 is a deficient number, since it is larger than the sum of its proper divisors (3132734179).

115911163217 is an equidigital number, since it uses as much as digits as its factorization.

115911163217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132734178.

The product of its digits is 11340, while the sum is 38.

The spelling of 115911163217 in words is "one hundred fifteen billion, nine hundred eleven million, one hundred sixty-three thousand, two hundred seventeen".