66239 has 2 divisors, whose sum is σ = 66240. Its totient is φ = 66238.

The previous prime is 66221. The next prime is 66271. The reversal of 66239 is 93266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66239 - 2⁸ = 65983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33119 + 33120.

It is an arithmetic number, because the mean of its divisors is an integer number (33120).

2⁶⁶²³⁹ is an apocalyptic number.

66239 is a deficient number, since it is larger than the sum of its proper divisors (1).

66239 is an equidigital number, since it uses as much as digits as its factorization.

66239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 26.

The square root of 66239 is about 257.3693843486. The cubic root of 66239 is about 40.4611220672.

The spelling of 66239 in words is "sixty-six thousand, two hundred thirty-nine".