166819816 has 32 divisors (see below), whose sum is σ = 325241280. Its totient is φ = 80150400.

The previous prime is 166819799. The next prime is 166819823. The reversal of 166819816 is 618918661.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18181 + ... + 25771.

It is an arithmetic number, because the mean of its divisors is an integer number (10163790).

Almost surely, 2^166819816 is an apocalyptic number.

It is an amenable number.

166819816 is a deficient number, since it is larger than the sum of its proper divisors (158421464).

166819816 is a wasteful number, since it uses less digits than its factorization.

166819816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7705 (or 7701 counting only the distinct ones).

The product of its digits is 124416, while the sum is 46.

The square root of 166819816 is about 12915.8745735626. The cubic root of 166819816 is about 550.4897191972.

The spelling of 166819816 in words is "one hundred sixty-six million, eight hundred nineteen thousand, eight hundred sixteen".