12267646818 has 128 divisors (see below), whose sum is σ = 30667714560. Its totient is φ = 3193344000.

The previous prime is 12267646813. The next prime is 12267646823. The reversal of 12267646818 is 81864676221.

It is an interprime number because it is at equal distance from previous prime (12267646813) and next prime (12267646823).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12267646813) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2320338 + ... + 2325618.

It is an arithmetic number, because the mean of its divisors is an integer number (239591520).

Almost surely, 2^12267646818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12267646818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15333857280).

12267646818 is an abundant number, since it is smaller than the sum of its proper divisors (18400067742).

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

12267646818 is a wasteful number, since it uses less digits than its factorization.

12267646818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5424.

The product of its digits is 1548288, while the sum is 51.

The spelling of 12267646818 in words is "twelve billion, two hundred sixty-seven million, six hundred forty-six thousand, eight hundred eighteen".