663171 has 8 divisors (see below), whose sum is σ = 888000. Its totient is φ = 440232.

The previous prime is 663167. The next prime is 663191. The reversal of 663171 is 171366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 663171 - 2² = 663167 is a prime.

It is an Ulam number.

663171 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (663161) 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, 1080 + ... + 1578.

It is an arithmetic number, because the mean of its divisors is an integer number (111000).

2⁶⁶³¹⁷¹ is an apocalyptic number.

663171 is a deficient number, since it is larger than the sum of its proper divisors (224829).

663171 is a wasteful number, since it uses less digits than its factorization.

663171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945.

The product of its digits is 756, while the sum is 24.

The square root of 663171 is about 814.3531175111. The cubic root of 663171 is about 87.2050915160.

The spelling of 663171 in words is "six hundred sixty-three thousand, one hundred seventy-one".