66870173 has 4 divisors (see below), whose sum is σ = 66892320. Its totient is φ = 66848028.

The previous prime is 66870161. The next prime is 66870179. The reversal of 66870173 is 37107866.

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 a cyclic number.

It is not a de Polignac number, because 66870173 - 2⁶ = 66870109 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 (66870179) 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, 5663 + ... + 12876.

It is an arithmetic number, because the mean of its divisors is an integer number (16723080).

Almost surely, 2^66870173 is an apocalyptic number.

It is an amenable number.

66870173 is a deficient number, since it is larger than the sum of its proper divisors (22147).

66870173 is a wasteful number, since it uses less digits than its factorization.

66870173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22146.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 66870173 is about 8177.4184801806. The cubic root of 66870173 is about 405.8923028021.

The spelling of 66870173 in words is "sixty-six million, eight hundred seventy thousand, one hundred seventy-three".