66571273173 has 4 divisors (see below), whose sum is σ = 88761697568. Its totient is φ = 44380848780.

The previous prime is 66571273169. The next prime is 66571273183. The reversal of 66571273173 is 37137217566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66571273173 - 2² = 66571273169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66571273183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11095212193 + ... + 11095212198.

It is an arithmetic number, because the mean of its divisors is an integer number (22190424392).

Almost surely, 2^66571273173 is an apocalyptic number.

It is an amenable number.

66571273173 is a deficient number, since it is larger than the sum of its proper divisors (22190424395).

66571273173 is a wasteful number, since it uses less digits than its factorization.

66571273173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22190424394.

The product of its digits is 1111320, while the sum is 48.

The spelling of 66571273173 in words is "sixty-six billion, five hundred seventy-one million, two hundred seventy-three thousand, one hundred seventy-three".