166065261 has 8 divisors (see below), whose sum is σ = 223703424. Its totient is φ = 109568640.

The previous prime is 166065259. The next prime is 166065283. The reversal of 166065261 is 162560661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166065261 - 2¹ = 166065259 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166065161) 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 in 7 ways as a sum of consecutive naturals, for example, 285045 + ... + 285626.

It is an arithmetic number, because the mean of its divisors is an integer number (27962928).

Almost surely, 2^166065261 is an apocalyptic number.

It is an amenable number.

166065261 is a deficient number, since it is larger than the sum of its proper divisors (57638163).

166065261 is an equidigital number, since it uses as much as digits as its factorization.

166065261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570771.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 166065261 is about 12886.6310958295. The cubic root of 166065261 is about 549.6584777830.

The spelling of 166065261 in words is "one hundred sixty-six million, sixty-five thousand, two hundred sixty-one".