166785073 has 24 divisors (see below), whose sum is σ = 210978432. Its totient is φ = 130675104.

The previous prime is 166785049. The next prime is 166785083. The reversal of 166785073 is 370587661.

It is not a de Polignac number, because 166785073 - 2¹³ = 166776881 is a prime.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (166785013) 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 23 ways as a sum of consecutive naturals, for example, 66936 + ... + 69382.

It is an arithmetic number, because the mean of its divisors is an integer number (8790768).

Almost surely, 2^166785073 is an apocalyptic number.

166785073 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

166785073 is a deficient number, since it is larger than the sum of its proper divisors (44193359).

166785073 is a wasteful number, since it uses less digits than its factorization.

166785073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581 (or 2574 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 166785073 is about 12914.5295307262. The cubic root of 166785073 is about 550.4515003320.

The spelling of 166785073 in words is "one hundred sixty-six million, seven hundred eighty-five thousand, seventy-three".