666674 has 4 divisors (see below), whose sum is σ = 1000014. Its totient is φ = 333336.

The previous prime is 666671. The next prime is 666683. The reversal of 666674 is 476666.

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

It can be written as a sum of positive squares in only one way, i.e., 600625 + 66049 = 775^2 + 257^2 .

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (666671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166667 + ... + 166670.

2⁶⁶⁶⁶⁷⁴ is an apocalyptic number.

666674 is a deficient number, since it is larger than the sum of its proper divisors (333340).

666674 is a wasteful number, since it uses less digits than its factorization.

666674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333339.

The product of its digits is 36288, while the sum is 35.

The square root of 666674 is about 816.5010716466. The cubic root of 666674 is about 87.3583667853.

The spelling of 666674 in words is "six hundred sixty-six thousand, six hundred seventy-four".