66173439 has 8 divisors (see below), whose sum is σ = 88284672. Its totient is φ = 44088920.

The previous prime is 66173423. The next prime is 66173441. The reversal of 66173439 is 93437166.

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 66173439 - 2⁴ = 66173423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66173397 and 66173406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66173449) 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, 82 + ... + 11504.

It is an arithmetic number, because the mean of its divisors is an integer number (11035584).

Almost surely, 2^66173439 is an apocalyptic number.

66173439 is a deficient number, since it is larger than the sum of its proper divisors (22111233).

66173439 is a wasteful number, since it uses less digits than its factorization.

66173439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13357.

The product of its digits is 81648, while the sum is 39.

The square root of 66173439 is about 8134.7058336488. The cubic root of 66173439 is about 404.4776866878.

The spelling of 66173439 in words is "sixty-six million, one hundred seventy-three thousand, four hundred thirty-nine".