117166323581 has 2 divisors, whose sum is σ = 117166323582. Its totient is φ = 117166323580.

The previous prime is 117166323523. The next prime is 117166323587. The reversal of 117166323581 is 185323661711.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58682640025 + 58483683556 = 242245^2 + 241834^2 .

It is an emirp because it is prime and its reverse (185323661711) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117166323581 is a prime.

It is a super-2 number, since 2×117166323581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117166323587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58583161790 + 58583161791.

It is an arithmetic number, because the mean of its divisors is an integer number (58583161791).

Almost surely, 2^117166323581 is an apocalyptic number.

It is an amenable number.

117166323581 is a deficient number, since it is larger than the sum of its proper divisors (1).

117166323581 is an equidigital number, since it uses as much as digits as its factorization.

117166323581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The spelling of 117166323581 in words is "one hundred seventeen billion, one hundred sixty-six million, three hundred twenty-three thousand, five hundred eighty-one".