666374 has 4 divisors (see below), whose sum is σ = 999564. Its totient is φ = 333186.

The previous prime is 666353. The next prime is 666403. The reversal of 666374 is 473666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 666374.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166592 + ... + 166595.

It is an arithmetic number, because the mean of its divisors is an integer number (249891).

2⁶⁶⁶³⁷⁴ is an apocalyptic number.

666374 is a deficient number, since it is larger than the sum of its proper divisors (333190).

666374 is a wasteful number, since it uses less digits than its factorization.

666374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333189.

The product of its digits is 18144, while the sum is 32.

The square root of 666374 is about 816.3173402544. The cubic root of 666374 is about 87.3452612084.

The spelling of 666374 in words is "six hundred sixty-six thousand, three hundred seventy-four".