12518117666 has 8 divisors (see below), whose sum is σ = 18790284204. Its totient is φ = 6254689600.

The previous prime is 12518117629. The next prime is 12518117683. The reversal of 12518117666 is 66671181521.

It can be written as a sum of positive squares in 2 ways, for example, as 11104733641 + 1413384025 = 105379^2 + 37595^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2181035 + ... + 2186766.

Almost surely, 2^12518117666 is an apocalyptic number.

12518117666 is a deficient number, since it is larger than the sum of its proper divisors (6272166538).

12518117666 is a wasteful number, since it uses less digits than its factorization.

12518117666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4369236.

The product of its digits is 120960, while the sum is 44.

The spelling of 12518117666 in words is "twelve billion, five hundred eighteen million, one hundred seventeen thousand, six hundred sixty-six".