664266 has 8 divisors (see below), whose sum is σ = 1328544. Its totient is φ = 221420.

The previous prime is 664253. The next prime is 664271. The reversal of 664266 is 662466.

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

664266 is an admirable number.

It is a d-powerful number, because it can be written as 6 + 6⁶ + 2¹⁹ + 4 + 6⁶ + 6⁶ .

It is an unprimeable number.

664266 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55350 + ... + 55361.

It is an arithmetic number, because the mean of its divisors is an integer number (166068).

2⁶⁶⁴²⁶⁶ is an apocalyptic number.

664266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664266 is a wasteful number, since it uses less digits than its factorization.

664266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110716.

The product of its digits is 10368, while the sum is 30.

The square root of 664266 is about 815.0251529861. The cubic root of 664266 is about 87.2530615806.

The spelling of 664266 in words is "six hundred sixty-four thousand, two hundred sixty-six".