665454 has 8 divisors (see below), whose sum is σ = 1330920. Its totient is φ = 221816.

The previous prime is 665447. The next prime is 665479. The reversal of 665454 is 454566.

It is a sphenic number, since it is the product of 3 distinct primes.

665454 is an admirable number.

It is a super-2 number, since 2×665454² = 885658052232, which contains 22 as substring.

665454 is a modest number, since divided by 5454 gives 66 as remainder.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

665454 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 55449 + ... + 55460.

It is an arithmetic number, because the mean of its divisors is an integer number (166365).

2⁶⁶⁵⁴⁵⁴ is an apocalyptic number.

665454 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665454 is a wasteful number, since it uses less digits than its factorization.

665454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110914.

The product of its digits is 14400, while the sum is 30.

The square root of 665454 is about 815.7536392809. The cubic root of 665454 is about 87.3050462293.

The spelling of 665454 in words is "six hundred sixty-five thousand, four hundred fifty-four".