12216643615 has 16 divisors (see below), whose sum is σ = 16933445280. Its totient is φ = 8362193920.

The previous prime is 12216643529. The next prime is 12216643619. The reversal of 12216643615 is 51634661221.

It is not a de Polignac number, because 12216643615 - 2⁷ = 12216643487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216643619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6532030 + ... + 6533899.

It is an arithmetic number, because the mean of its divisors is an integer number (1058340330).

Almost surely, 2^12216643615 is an apocalyptic number.

12216643615 is a deficient number, since it is larger than the sum of its proper divisors (4716801665).

12216643615 is a wasteful number, since it uses less digits than its factorization.

12216643615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13065962.

The product of its digits is 51840, while the sum is 37.

The spelling of 12216643615 in words is "twelve billion, two hundred sixteen million, six hundred forty-three thousand, six hundred fifteen".