166666408 has 8 divisors (see below), whose sum is σ = 312499530. Its totient is φ = 83333200.

The previous prime is 166666403. The next prime is 166666417. The reversal of 166666408 is 804666661.

It can be written as a sum of positive squares in only one way, i.e., 160224964 + 6441444 = 12658^2 + 2538^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (166666403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10416643 + ... + 10416658.

Almost surely, 2^166666408 is an apocalyptic number.

It is an amenable number.

166666408 is a deficient number, since it is larger than the sum of its proper divisors (145833122).

166666408 is a wasteful number, since it uses less digits than its factorization.

166666408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20833307 (or 20833303 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 166666408 is about 12909.9344692372. The cubic root of 166666408 is about 550.3209234495.

The spelling of 166666408 in words is "one hundred sixty-six million, six hundred sixty-six thousand, four hundred eight".