166745866 has 16 divisors (see below), whose sum is σ = 286174656. Its totient is φ = 71381376.

The previous prime is 166745863. The next prime is 166745899. The reversal of 166745866 is 668547661.

It is not an unprimeable number, because it can be changed into a prime (166745863) 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 in 7 ways as a sum of consecutive naturals, for example, 6970 + ... + 19546.

It is an arithmetic number, because the mean of its divisors is an integer number (17885916).

Almost surely, 2^166745866 is an apocalyptic number.

166745866 is a deficient number, since it is larger than the sum of its proper divisors (119428790).

166745866 is a wasteful number, since it uses less digits than its factorization.

166745866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13533.

The product of its digits is 1451520, while the sum is 49.

The square root of 166745866 is about 12913.0115000336. The cubic root of 166745866 is about 550.4083644907.

The spelling of 166745866 in words is "one hundred sixty-six million, seven hundred forty-five thousand, eight hundred sixty-six".