665453 has 4 divisors (see below), whose sum is σ = 673020. Its totient is φ = 657888.

The previous prime is 665447. The next prime is 665479. The reversal of 665453 is 354566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 354566 = 2 ⋅177283.

It can be written as a sum of positive squares in 2 ways, for example, as 413449 + 252004 = 643^2 + 502^2 .

It is not a de Polignac number, because 665453 - 2¹⁴ = 649069 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3650 + ... + 3827.

It is an arithmetic number, because the mean of its divisors is an integer number (168255).

2⁶⁶⁵⁴⁵³ is an apocalyptic number.

It is an amenable number.

665453 is a deficient number, since it is larger than the sum of its proper divisors (7567).

665453 is an equidigital number, since it uses as much as digits as its factorization.

665453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7566.

The product of its digits is 10800, while the sum is 29.

The square root of 665453 is about 815.7530263505. The cubic root of 665453 is about 87.3050024972.

The spelling of 665453 in words is "six hundred sixty-five thousand, four hundred fifty-three".