166851001 has 2 divisors, whose sum is σ = 166851002. Its totient is φ = 166851000.

The previous prime is 166850969. The next prime is 166851031. The reversal of 166851001 is 100158661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148352400 + 18498601 = 12180^2 + 4301^2 .

It is a cyclic number.

It is not a de Polignac number, because 166851001 - 2⁵ = 166850969 is a prime.

It is not a weakly prime, because it can be changed into another prime (166851031) by changing a digit.

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 as a sum of consecutive naturals, namely, 83425500 + 83425501.

It is an arithmetic number, because the mean of its divisors is an integer number (83425501).

Almost surely, 2^166851001 is an apocalyptic number.

It is an amenable number.

166851001 is a deficient number, since it is larger than the sum of its proper divisors (1).

166851001 is an equidigital number, since it uses as much as digits as its factorization.

166851001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 166851001 is about 12917.0817524703. The cubic root of 166851001 is about 550.5240195833.

The spelling of 166851001 in words is "one hundred sixty-six million, eight hundred fifty-one thousand, one".