166161666 has 32 divisors (see below), whose sum is σ = 363138048. Its totient is φ = 50268240.

The previous prime is 166161659. The next prime is 166161673. The reversal of 166161666 is 666161661.

It is a happy number.

166161666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (166161659) and next prime (166161673).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46251 + ... + 49713.

It is an arithmetic number, because the mean of its divisors is an integer number (11348064).

Almost surely, 2^166161666 is an apocalyptic number.

166161666 is an abundant number, since it is smaller than the sum of its proper divisors (196976382).

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

166161666 is a wasteful number, since it uses less digits than its factorization.

166161666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4206.

The product of its digits is 46656, while the sum is 39.

The square root of 166161666 is about 12890.3710574987. The cubic root of 166161666 is about 549.7648206641.

The spelling of 166161666 in words is "one hundred sixty-six million, one hundred sixty-one thousand, six hundred sixty-six".