665644231 has 8 divisors (see below), whose sum is σ = 805485600. Its totient is φ = 536990208.

The previous prime is 665644223. The next prime is 665644253. The reversal of 665644231 is 132446566.

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 665644231 - 2³ = 665644223 is a prime.

It is a super-2 number, since 2×665644231² = 886164484527162722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665644831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2796706 + ... + 2796943.

It is an arithmetic number, because the mean of its divisors is an integer number (100685700).

Almost surely, 2^665644231 is an apocalyptic number.

665644231 is a deficient number, since it is larger than the sum of its proper divisors (139841369).

665644231 is a wasteful number, since it uses less digits than its factorization.

665644231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5593673.

The product of its digits is 103680, while the sum is 37.

The square root of 665644231 is about 25800.0819959937. The cubic root of 665644231 is about 873.1336463244.

The spelling of 665644231 in words is "six hundred sixty-five million, six hundred forty-four thousand, two hundred thirty-one".