12218788917 has 12 divisors (see below), whose sum is σ = 17761780140. Its totient is φ = 8093973888.

The previous prime is 12218788909. The next prime is 12218788927. The reversal of 12218788917 is 71988781221.

It can be written as a sum of positive squares in 2 ways, for example, as 3414532356 + 8804256561 = 58434^2 + 93831^2 .

It is not a de Polignac number, because 12218788917 - 2³ = 12218788909 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218788927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4322292 + ... + 4325117.

It is an arithmetic number, because the mean of its divisors is an integer number (1480148345).

Almost surely, 2^12218788917 is an apocalyptic number.

It is an amenable number.

12218788917 is a deficient number, since it is larger than the sum of its proper divisors (5542991223).

12218788917 is a wasteful number, since it uses less digits than its factorization.

12218788917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8647572 (or 8647569 counting only the distinct ones).

The product of its digits is 903168, while the sum is 54.

The spelling of 12218788917 in words is "twelve billion, two hundred eighteen million, seven hundred eighty-eight thousand, nine hundred seventeen".