12918566663 has 4 divisors (see below), whose sum is σ = 13137525480. Its totient is φ = 12699607848.

The previous prime is 12918566657. The next prime is 12918566681. The reversal of 12918566663 is 36666581921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36666581921 = 1307 ⋅28054003.

It is a cyclic number.

It is not a de Polignac number, because 12918566663 - 2⁶ = 12918566599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12918466663) 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, 109479320 + ... + 109479437.

It is an arithmetic number, because the mean of its divisors is an integer number (3284381370).

Almost surely, 2^12918566663 is an apocalyptic number.

12918566663 is a deficient number, since it is larger than the sum of its proper divisors (218958817).

12918566663 is an equidigital number, since it uses as much as digits as its factorization.

12918566663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218958816.

The product of its digits is 2799360, while the sum is 53.

The spelling of 12918566663 in words is "twelve billion, nine hundred eighteen million, five hundred sixty-six thousand, six hundred sixty-three".