12516166177 has 4 divisors (see below), whose sum is σ = 12645198916. Its totient is φ = 12387133440.

The previous prime is 12516166171. The next prime is 12516166181. The reversal of 12516166177 is 77166161521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1789628416 + 10726537761 = 42304^2 + 103569^2 .

It is a cyclic number.

It is not a de Polignac number, because 12516166177 - 2⁷ = 12516166049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12516166171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64516224 + ... + 64516417.

It is an arithmetic number, because the mean of its divisors is an integer number (3161299729).

Almost surely, 2^12516166177 is an apocalyptic number.

It is an amenable number.

12516166177 is a deficient number, since it is larger than the sum of its proper divisors (129032739).

12516166177 is an equidigital number, since it uses as much as digits as its factorization.

12516166177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129032738.

The product of its digits is 105840, while the sum is 43.

The spelling of 12516166177 in words is "twelve billion, five hundred sixteen million, one hundred sixty-six thousand, one hundred seventy-seven".