665146 has 4 divisors (see below), whose sum is σ = 997722. Its totient is φ = 332572.

The previous prime is 665141. The next prime is 665153. The reversal of 665146 is 641566.

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

It can be written as a sum of positive squares in only one way, i.e., 546121 + 119025 = 739^2 + 345^2 .

It is not an unprimeable number, because it can be changed into a prime (665141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166285 + ... + 166288.

2⁶⁶⁵¹⁴⁶ is an apocalyptic number.

665146 is a deficient number, since it is larger than the sum of its proper divisors (332576).

665146 is a wasteful number, since it uses less digits than its factorization.

665146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332575.

The product of its digits is 4320, while the sum is 28.

The square root of 665146 is about 815.5648349457. The cubic root of 665146 is about 87.2915746726.

The spelling of 665146 in words is "six hundred sixty-five thousand, one hundred forty-six".