12218949516 has 12 divisors (see below), whose sum is σ = 28510882232. Its totient is φ = 4072983168.

The previous prime is 12218949511. The next prime is 12218949521. The reversal of 12218949516 is 61594981221.

It is an interprime number because it is at equal distance from previous prime (12218949511) and next prime (12218949521).

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (12218949511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509122885 + ... + 509122908.

Almost surely, 2^12218949516 is an apocalyptic number.

It is an amenable number.

12218949516 is an abundant number, since it is smaller than the sum of its proper divisors (16291932716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12218949516 is a wasteful number, since it uses less digits than its factorization.

12218949516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018245800 (or 1018245798 counting only the distinct ones).

The product of its digits is 311040, while the sum is 48.

The spelling of 12218949516 in words is "twelve billion, two hundred eighteen million, nine hundred forty-nine thousand, five hundred sixteen".