666574 has 4 divisors (see below), whose sum is σ = 999864. Its totient is φ = 333286.

The previous prime is 666559. The next prime is 666599. The reversal of 666574 is 475666.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

666574 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166642 + ... + 166645.

It is an arithmetic number, because the mean of its divisors is an integer number (249966).

2⁶⁶⁶⁵⁷⁴ is an apocalyptic number.

666574 is a deficient number, since it is larger than the sum of its proper divisors (333290).

666574 is a wasteful number, since it uses less digits than its factorization.

666574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333289.

The product of its digits is 30240, while the sum is 34.

The square root of 666574 is about 816.4398324433. The cubic root of 666574 is about 87.3539986966.

The spelling of 666574 in words is "six hundred sixty-six thousand, five hundred seventy-four".