666373 has 4 divisors (see below), whose sum is σ = 682668. Its totient is φ = 650080.

The previous prime is 666353. The next prime is 666403. The reversal of 666373 is 373666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 213444 + 452929 = 462^2 + 673^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666373 is a prime.

It is a Duffinian number.

666373 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8086 + ... + 8167.

It is an arithmetic number, because the mean of its divisors is an integer number (170667).

2⁶⁶⁶³⁷³ is an apocalyptic number.

It is an amenable number.

666373 is a deficient number, since it is larger than the sum of its proper divisors (16295).

666373 is a wasteful number, since it uses less digits than its factorization.

666373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16294.

The product of its digits is 13608, while the sum is 31.

The square root of 666373 is about 816.3167277473. The cubic root of 666373 is about 87.3452175166.

The spelling of 666373 in words is "six hundred sixty-six thousand, three hundred seventy-three".