12218945807 has 4 divisors (see below), whose sum is σ = 12419256456. Its totient is φ = 12018635160.

The previous prime is 12218945803. The next prime is 12218945819. The reversal of 12218945807 is 70854981221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12218945807 - 2² = 12218945803 is a prime.

It is a super-3 number, since 3×12218945807³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218945801) 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, 100155233 + ... + 100155354.

It is an arithmetic number, because the mean of its divisors is an integer number (3104814114).

Almost surely, 2^12218945807 is an apocalyptic number.

12218945807 is a deficient number, since it is larger than the sum of its proper divisors (200310649).

12218945807 is an equidigital number, since it uses as much as digits as its factorization.

12218945807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200310648.

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 12218945807 in words is "twelve billion, two hundred eighteen million, nine hundred forty-five thousand, eight hundred seven".