166540259 has 4 divisors (see below), whose sum is σ = 166637016. Its totient is φ = 166443504.

The previous prime is 166540207. The next prime is 166540267. The reversal of 166540259 is 952045661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166540259 - 2¹² = 166536163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166560259) 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 3 ways as a sum of consecutive naturals, for example, 45749 + ... + 49254.

It is an arithmetic number, because the mean of its divisors is an integer number (41659254).

Almost surely, 2^166540259 is an apocalyptic number.

166540259 is a deficient number, since it is larger than the sum of its proper divisors (96757).

166540259 is an equidigital number, since it uses as much as digits as its factorization.

166540259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96756.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 166540259 is about 12905.0478108374. The cubic root of 166540259 is about 550.1820433205.

The spelling of 166540259 in words is "one hundred sixty-six million, five hundred forty thousand, two hundred fifty-nine".