665774 has 4 divisors (see below), whose sum is σ = 998664. Its totient is φ = 332886.

The previous prime is 665773. The next prime is 665783. The reversal of 665774 is 477566.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166442 + ... + 166445.

It is an arithmetic number, because the mean of its divisors is an integer number (249666).

2⁶⁶⁵⁷⁷⁴ is an apocalyptic number.

665774 is a deficient number, since it is larger than the sum of its proper divisors (332890).

665774 is a wasteful number, since it uses less digits than its factorization.

665774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332889.

The product of its digits is 35280, while the sum is 35.

The square root of 665774 is about 815.9497533549. The cubic root of 665774 is about 87.3190382497.

The spelling of 665774 in words is "six hundred sixty-five thousand, seven hundred seventy-four".