12208818138 has 32 divisors (see below), whose sum is σ = 26641690560. Its totient is φ = 3699048960.

The previous prime is 12208818137. The next prime is 12208818179. The reversal of 12208818138 is 83181880221.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12208818138.

It is not an unprimeable number, because it can be changed into a prime (12208818137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 578956 + ... + 599672.

It is an arithmetic number, because the mean of its divisors is an integer number (832552830).

Almost surely, 2^12208818138 is an apocalyptic number.

12208818138 is an abundant number, since it is smaller than the sum of its proper divisors (14432872422).

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

12208818138 is a wasteful number, since it uses less digits than its factorization.

12208818138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29662.

The product of its (nonzero) digits is 49152, while the sum is 42.

The spelling of 12208818138 in words is "twelve billion, two hundred eight million, eight hundred eighteen thousand, one hundred thirty-eight".