1217138166 has 12 divisors (see below), whose sum is σ = 2637132732. Its totient is φ = 405712716.

The previous prime is 1217138123. The next prime is 1217138191. The reversal of 1217138166 is 6618317121.

1217138166 is a `hidden beast` number, since 1 + 217 + 1 + 381 + 66 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1217138166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33809376 + ... + 33809411.

It is an arithmetic number, because the mean of its divisors is an integer number (219761061).

Almost surely, 2^1217138166 is an apocalyptic number.

1217138166 is an abundant number, since it is smaller than the sum of its proper divisors (1419994566).

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

1217138166 is a wasteful number, since it uses less digits than its factorization.

1217138166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67618795 (or 67618792 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1217138166 is about 34887.5073056245. The cubic root of 1217138166 is about 1067.6935692433.

The spelling of 1217138166 in words is "one billion, two hundred seventeen million, one hundred thirty-eight thousand, one hundred sixty-six".