12181664773 has 2 divisors, whose sum is σ = 12181664774. Its totient is φ = 12181664772.

The previous prime is 12181664723. The next prime is 12181664791. The reversal of 12181664773 is 37746618121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9005440609 + 3176224164 = 94897^2 + 56358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12181664773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12181664713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090832386 + 6090832387.

It is an arithmetic number, because the mean of its divisors is an integer number (6090832387).

Almost surely, 2^12181664773 is an apocalyptic number.

It is an amenable number.

12181664773 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181664773 is an equidigital number, since it uses as much as digits as its factorization.

12181664773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The spelling of 12181664773 in words is "twelve billion, one hundred eighty-one million, six hundred sixty-four thousand, seven hundred seventy-three".