12643227198 has 64 divisors (see below), whose sum is σ = 32793016320. Its totient is φ = 3535487136.

The previous prime is 12643227197. The next prime is 12643227203. The reversal of 12643227198 is 89172234621.

12643227198 is a `hidden beast` number, since 1 + 2 + 6 + 432 + 27 + 198 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643227197) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 338061 + ... + 373592.

It is an arithmetic number, because the mean of its divisors is an integer number (512390880).

Almost surely, 2^12643227198 is an apocalyptic number.

12643227198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12643227198 is an abundant number, since it is smaller than the sum of its proper divisors (20149789122).

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

12643227198 is a wasteful number, since it uses less digits than its factorization.

12643227198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711718 (or 711712 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The spelling of 12643227198 in words is "twelve billion, six hundred forty-three million, two hundred twenty-seven thousand, one hundred ninety-eight".