66173194139 has 8 divisors (see below), whose sum is σ = 71266379520. Its totient is φ = 61080428736.

The previous prime is 66173194111. The next prime is 66173194187. The reversal of 66173194139 is 93149137166.

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 66173194139 - 2¹⁶ = 66173128603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66173194189) 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, 272567 + ... + 454575.

It is an arithmetic number, because the mean of its divisors is an integer number (8908297440).

Almost surely, 2^66173194139 is an apocalyptic number.

66173194139 is a deficient number, since it is larger than the sum of its proper divisors (5093185381).

66173194139 is a wasteful number, since it uses less digits than its factorization.

66173194139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209989.

The product of its digits is 734832, while the sum is 50.

The spelling of 66173194139 in words is "sixty-six billion, one hundred seventy-three million, one hundred ninety-four thousand, one hundred thirty-nine".