166666628 has 6 divisors (see below), whose sum is σ = 291666606. Its totient is φ = 83333312.

The previous prime is 166666627. The next prime is 166666631. The reversal of 166666628 is 826666661.

It can be written as a sum of positive squares in only one way, i.e., 130690624 + 35976004 = 11432^2 + 5998^2 .

It is not an unprimeable number, because it can be changed into a prime (166666627) 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, 20833325 + ... + 20833332.

It is an arithmetic number, because the mean of its divisors is an integer number (48611101).

Almost surely, 2^166666628 is an apocalyptic number.

It is an amenable number.

166666628 is a deficient number, since it is larger than the sum of its proper divisors (124999978).

166666628 is a wasteful number, since it uses less digits than its factorization.

166666628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41666661 (or 41666659 counting only the distinct ones).

The product of its digits is 746496, while the sum is 47.

The square root of 166666628 is about 12909.9429898044. The cubic root of 166666628 is about 550.3211655909.

The spelling of 166666628 in words is "one hundred sixty-six million, six hundred sixty-six thousand, six hundred twenty-eight".