666245 has 8 divisors (see below), whose sum is σ = 804384. Its totient is φ = 529744.

The previous prime is 666233. The next prime is 666269. The reversal of 666245 is 542666.

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

It is a cyclic number.

It is not a de Polignac number, because 666245 - 2⁴ = 666229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 842 + ... + 1428.

It is an arithmetic number, because the mean of its divisors is an integer number (100548).

2⁶⁶⁶²⁴⁵ is an apocalyptic number.

It is an amenable number.

666245 is a deficient number, since it is larger than the sum of its proper divisors (138139).

666245 is a wasteful number, since it uses less digits than its factorization.

666245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819.

The product of its digits is 8640, while the sum is 29.

The square root of 666245 is about 816.2383230405. The cubic root of 666245 is about 87.3396246010.

The spelling of 666245 in words is "six hundred sixty-six thousand, two hundred forty-five".