166894121 has 2 divisors, whose sum is σ = 166894122. Its totient is φ = 166894120.

The previous prime is 166894099. The next prime is 166894139. The reversal of 166894121 is 121498661.

166894121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158256400 + 8637721 = 12580^2 + 2939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166894121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166894171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83447060 + 83447061.

It is an arithmetic number, because the mean of its divisors is an integer number (83447061).

Almost surely, 2^166894121 is an apocalyptic number.

It is an amenable number.

166894121 is a deficient number, since it is larger than the sum of its proper divisors (1).

166894121 is an equidigital number, since it uses as much as digits as its factorization.

166894121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 166894121 is about 12918.7507522980. The cubic root of 166894121 is about 550.5714402379.

The spelling of 166894121 in words is "one hundred sixty-six million, eight hundred ninety-four thousand, one hundred twenty-one".