12117186881 has 2 divisors, whose sum is σ = 12117186882. Its totient is φ = 12117186880.

The previous prime is 12117186877. The next prime is 12117186919. The reversal of 12117186881 is 18868171121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10795210000 + 1321976881 = 103900^2 + 36359^2 .

It is an emirp because it is prime and its reverse (18868171121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12117186881 - 2² = 12117186877 is a prime.

It is a super-2 number, since 2×12117186881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12117186181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6058593440 + 6058593441.

It is an arithmetic number, because the mean of its divisors is an integer number (6058593441).

Almost surely, 2^12117186881 is an apocalyptic number.

It is an amenable number.

12117186881 is a deficient number, since it is larger than the sum of its proper divisors (1).

12117186881 is an equidigital number, since it uses as much as digits as its factorization.

12117186881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 44.

The spelling of 12117186881 in words is "twelve billion, one hundred seventeen million, one hundred eighty-six thousand, eight hundred eighty-one".