166814261 has 2 divisors, whose sum is σ = 166814262. Its totient is φ = 166814260.

The previous prime is 166814237. The next prime is 166814273. The reversal of 166814261 is 162418661.

166814261 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., 102718225 + 64096036 = 10135^2 + 8006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166814261 is a prime.

It is a super-2 number, since 2×166814261² = 55653995345952242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_9334772 and since 166814261 and 9334772 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166814201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83407130 + 83407131.

It is an arithmetic number, because the mean of its divisors is an integer number (83407131).

Almost surely, 2^166814261 is an apocalyptic number.

It is an amenable number.

166814261 is a deficient number, since it is larger than the sum of its proper divisors (1).

166814261 is an equidigital number, since it uses as much as digits as its factorization.

166814261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 166814261 is about 12915.6595263269. The cubic root of 166814261 is about 550.4836088034.

The spelling of 166814261 in words is "one hundred sixty-six million, eight hundred fourteen thousand, two hundred sixty-one".