66665339 has 16 divisors (see below), whose sum is σ = 76204800. Its totient is φ = 57848736.

The previous prime is 66665329. The next prime is 66665341. The reversal of 66665339 is 93356666.

It is a cyclic number.

It is not a de Polignac number, because 66665339 - 2⁴ = 66665323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66665339.

It is not an unprimeable number, because it can be changed into a prime (66665329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15752 + ... + 19530.

It is an arithmetic number, because the mean of its divisors is an integer number (4762800).

Almost surely, 2^66665339 is an apocalyptic number.

66665339 is a deficient number, since it is larger than the sum of its proper divisors (9539461).

66665339 is a wasteful number, since it uses less digits than its factorization.

66665339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3874.

The product of its digits is 524880, while the sum is 44.

The square root of 66665339 is about 8164.8845062254. The cubic root of 66665339 is about 405.4774413081.

The spelling of 66665339 in words is "sixty-six million, six hundred sixty-five thousand, three hundred thirty-nine".