66139339 has 8 divisors (see below), whose sum is σ = 75807200. Its totient is φ = 56526336.

The previous prime is 66139331. The next prime is 66139351. The reversal of 66139339 is 93393166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66139339 - 2³ = 66139331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66139331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11094 + ... + 15979.

It is an arithmetic number, because the mean of its divisors is an integer number (9475900).

Almost surely, 2^66139339 is an apocalyptic number.

66139339 is a deficient number, since it is larger than the sum of its proper divisors (9667861).

66139339 is a wasteful number, since it uses less digits than its factorization.

66139339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27429.

The product of its digits is 78732, while the sum is 40.

The square root of 66139339 is about 8132.6096057785. The cubic root of 66139339 is about 404.4081972814.

It can be divided in two parts, 661 and 39339, that added together give a square (40000 = 200²).

The spelling of 66139339 in words is "sixty-six million, one hundred thirty-nine thousand, three hundred thirty-nine".