665741 has 8 divisors (see below), whose sum is σ = 720480. Its totient is φ = 613008.

The previous prime is 665723. The next prime is 665747. The reversal of 665741 is 147566.

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 665741 - 2⁶ = 665677 is a prime.

It is a super-2 number, since 2×665741² = 886422158162, which contains 22 as substring.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665747) 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, 230 + ... + 1176.

It is an arithmetic number, because the mean of its divisors is an integer number (90060).

2⁶⁶⁵⁷⁴¹ is an apocalyptic number.

It is an amenable number.

665741 is a deficient number, since it is larger than the sum of its proper divisors (54739).

665741 is a wasteful number, since it uses less digits than its factorization.

665741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003.

The product of its digits is 5040, while the sum is 29.

The square root of 665741 is about 815.9295312709. The cubic root of 665741 is about 87.3175955300.

The spelling of 665741 in words is "six hundred sixty-five thousand, seven hundred forty-one".