166645837 has 2 divisors, whose sum is σ = 166645838. Its totient is φ = 166645836.

The previous prime is 166645811. The next prime is 166645867. The reversal of 166645837 is 738546661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149181796 + 17464041 = 12214^2 + 4179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166645837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166645807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83322918 + 83322919.

It is an arithmetic number, because the mean of its divisors is an integer number (83322919).

Almost surely, 2^166645837 is an apocalyptic number.

It is an amenable number.

166645837 is a deficient number, since it is larger than the sum of its proper divisors (1).

166645837 is an equidigital number, since it uses as much as digits as its factorization.

166645837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The square root of 166645837 is about 12909.1377326296. The cubic root of 166645837 is about 550.2982811793.

The spelling of 166645837 in words is "one hundred sixty-six million, six hundred forty-five thousand, eight hundred thirty-seven".