668453 has 4 divisors (see below), whose sum is σ = 690048. Its totient is φ = 646860.

The previous prime is 668417. The next prime is 668471. The reversal of 668453 is 354866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 354866 = 2 ⋅177433.

It is a cyclic number.

It is not a de Polignac number, because 668453 - 2¹² = 664357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10751 + ... + 10812.

It is an arithmetic number, because the mean of its divisors is an integer number (172512).

2⁶⁶⁸⁴⁵³ is an apocalyptic number.

It is an amenable number.

668453 is a deficient number, since it is larger than the sum of its proper divisors (21595).

668453 is a wasteful number, since it uses less digits than its factorization.

668453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21594.

The product of its digits is 17280, while the sum is 32.

The square root of 668453 is about 817.5897504250. The cubic root of 668453 is about 87.4360021828.

The spelling of 668453 in words is "six hundred sixty-eight thousand, four hundred fifty-three".