668499 has 16 divisors (see below), whose sum is σ = 979104. Its totient is φ = 403200.

The previous prime is 668471. The next prime is 668509. The reversal of 668499 is 994866.

668499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668499 - 2⁸ = 668243 is a prime.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 668499.

It is not an unprimeable number, because it can be changed into a prime (668599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2239 + ... + 2519.

It is an arithmetic number, because the mean of its divisors is an integer number (61194).

2⁶⁶⁸⁴⁹⁹ is an apocalyptic number.

668499 is a deficient number, since it is larger than the sum of its proper divisors (310605).

668499 is a wasteful number, since it uses less digits than its factorization.

668499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358.

The product of its digits is 93312, while the sum is 42.

The square root of 668499 is about 817.6178814092. The cubic root of 668499 is about 87.4380077907.

The spelling of 668499 in words is "six hundred sixty-eight thousand, four hundred ninety-nine".