664166 has 8 divisors (see below), whose sum is σ = 1008504. Its totient is φ = 328000.

The previous prime is 664151. The next prime is 664177. The reversal of 664166 is 661466.

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

It is a super-2 number, since 2×664166² = 882232951112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1835 + ... + 2166.

It is an arithmetic number, because the mean of its divisors is an integer number (126063).

2⁶⁶⁴¹⁶⁶ is an apocalyptic number.

664166 is a deficient number, since it is larger than the sum of its proper divisors (344338).

664166 is a wasteful number, since it uses less digits than its factorization.

664166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086.

The product of its digits is 5184, while the sum is 29.

The square root of 664166 is about 814.9638028772. The cubic root of 664166 is about 87.2486829411.

It can be divided in two parts, 664 and 166, that multiplied together give a square (110224 = 332²).

The spelling of 664166 in words is "six hundred sixty-four thousand, one hundred sixty-six".