66839923 has 8 divisors (see below), whose sum is σ = 67382208. Its totient is φ = 66300264.

The previous prime is 66839917. The next prime is 66839959. The reversal of 66839923 is 32993866.

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 66839923 - 2⁹ = 66839411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66839023) 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 7 ways as a sum of consecutive naturals, for example, 118440 + ... + 119002.

It is an arithmetic number, because the mean of its divisors is an integer number (8422776).

Almost surely, 2^66839923 is an apocalyptic number.

66839923 is a deficient number, since it is larger than the sum of its proper divisors (542285).

66839923 is a wasteful number, since it uses less digits than its factorization.

66839923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313.

The product of its digits is 419904, while the sum is 46.

The square root of 66839923 is about 8175.5686652367. The cubic root of 66839923 is about 405.8310891921.

The spelling of 66839923 in words is "sixty-six million, eight hundred thirty-nine thousand, nine hundred twenty-three".