18644227266 has 48 divisors (see below), whose sum is σ = 44775624960. Its totient is φ = 5155083360.

The previous prime is 18644227207. The next prime is 18644227307. The reversal of 18644227266 is 66272244681.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1013721 + ... + 1031948.

It is an arithmetic number, because the mean of its divisors is an integer number (932825520).

Almost surely, 2^18644227266 is an apocalyptic number.

18644227266 is an abundant number, since it is smaller than the sum of its proper divisors (26131397694).

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

18644227266 is a wasteful number, since it uses less digits than its factorization.

18644227266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045719 (or 2045712 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 48.

The spelling of 18644227266 in words is "eighteen billion, six hundred forty-four million, two hundred twenty-seven thousand, two hundred sixty-six".