12217061808 has 480 divisors, whose sum is σ = 42092544000. Its totient is φ = 3302208000.

The previous prime is 12217061789. The next prime is 12217061819. The reversal of 12217061808 is 80816071221.

12217061808 is a `hidden beast` number, since 1 + 22 + 17 + 0 + 618 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 120960958 + ... + 120961058.

It is an arithmetic number, because the mean of its divisors is an integer number (87692800).

Almost surely, 2^12217061808 is an apocalyptic number.

12217061808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12217061808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21046272000).

12217061808 is an abundant number, since it is smaller than the sum of its proper divisors (29875482192).

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

12217061808 is a wasteful number, since it uses less digits than its factorization.

12217061808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The spelling of 12217061808 in words is "twelve billion, two hundred seventeen million, sixty-one thousand, eight hundred eight".