666454 has 4 divisors (see below), whose sum is σ = 999684. Its totient is φ = 333226.

The previous prime is 666439. The next prime is 666461. The reversal of 666454 is 454666.

666454 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166612 + ... + 166615.

It is an arithmetic number, because the mean of its divisors is an integer number (249921).

2⁶⁶⁶⁴⁵⁴ is an apocalyptic number.

666454 is a deficient number, since it is larger than the sum of its proper divisors (333230).

666454 is a wasteful number, since it uses less digits than its factorization.

666454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333229.

The product of its digits is 17280, while the sum is 31.

The square root of 666454 is about 816.3663393355. The cubic root of 666454 is about 87.3487564134.

The spelling of 666454 in words is "six hundred sixty-six thousand, four hundred fifty-four".