166333261 has 2 divisors, whose sum is σ = 166333262. Its totient is φ = 166333260.

The previous prime is 166333249. The next prime is 166333267. The reversal of 166333261 is 162333661.

166333261 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., 148108900 + 18224361 = 12170^2 + 4269^2 .

It is a cyclic number.

It is not a de Polignac number, because 166333261 - 2²³ = 157944653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166333267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83166630 + 83166631.

It is an arithmetic number, because the mean of its divisors is an integer number (83166631).

Almost surely, 2^166333261 is an apocalyptic number.

It is an amenable number.

166333261 is a deficient number, since it is larger than the sum of its proper divisors (1).

166333261 is an equidigital number, since it uses as much as digits as its factorization.

166333261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 31.

The square root of 166333261 is about 12897.0252771715. The cubic root of 166333261 is about 549.9540027649.

The spelling of 166333261 in words is "one hundred sixty-six million, three hundred thirty-three thousand, two hundred sixty-one".