664167 has 8 divisors (see below), whose sum is σ = 1012096. Its totient is φ = 379512.

The previous prime is 664151. The next prime is 664177. The reversal of 664167 is 761466.

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

It is not a de Polignac number, because 664167 - 2⁴ = 664151 is a prime.

It is a super-2 number, since 2×664167² = 882235607778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664117) 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, 15793 + ... + 15834.

It is an arithmetic number, because the mean of its divisors is an integer number (126512).

2⁶⁶⁴¹⁶⁷ is an apocalyptic number.

664167 is a deficient number, since it is larger than the sum of its proper divisors (347929).

664167 is a wasteful number, since it uses less digits than its factorization.

664167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31637.

The product of its digits is 6048, while the sum is 30.

The square root of 664167 is about 814.9644164011. The cubic root of 664167 is about 87.2487267297.

The spelling of 664167 in words is "six hundred sixty-four thousand, one hundred sixty-seven".