666711173 has 4 divisors (see below), whose sum is σ = 682216128. Its totient is φ = 651206220.

The previous prime is 666711119. The next prime is 666711217. The reversal of 666711173 is 371117666.

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, and also an emirpimes, since its reverse is a distinct semiprime: 371117666 = 2 ⋅185558833.

It is a cyclic number.

It is not a de Polignac number, because 666711173 - 2⁶ = 666711109 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 (666711113) 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, 7752413 + ... + 7752498.

It is an arithmetic number, because the mean of its divisors is an integer number (170554032).

Almost surely, 2^666711173 is an apocalyptic number.

It is an amenable number.

666711173 is a deficient number, since it is larger than the sum of its proper divisors (15504955).

666711173 is a wasteful number, since it uses less digits than its factorization.

666711173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15504954.

The product of its digits is 31752, while the sum is 38.

The square root of 666711173 is about 25820.7508217712. The cubic root of 666711173 is about 873.5999042354.

The spelling of 666711173 in words is "six hundred sixty-six million, seven hundred eleven thousand, one hundred seventy-three".