166638216 has 32 divisors (see below), whose sum is σ = 441102240. Its totient is φ = 52278528.

The previous prime is 166638211. The next prime is 166638217. The reversal of 166638216 is 612836661.

166638216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (166638211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203806 + ... + 204621.

It is an arithmetic number, because the mean of its divisors is an integer number (13784445).

Almost surely, 2^166638216 is an apocalyptic number.

It is an amenable number.

166638216 is an abundant number, since it is smaller than the sum of its proper divisors (274464024).

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

166638216 is a wasteful number, since it uses less digits than its factorization.

166638216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408453 (or 408449 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 166638216 is about 12908.8425507479. The cubic root of 166638216 is about 550.2898923566.

The spelling of 166638216 in words is "one hundred sixty-six million, six hundred thirty-eight thousand, two hundred sixteen".