668015 has 16 divisors (see below), whose sum is σ = 881280. Its totient is φ = 483840.

The previous prime is 668009. The next prime is 668029. The reversal of 668015 is 510866.

It is not a de Polignac number, because 668015 - 2⁴ = 667999 is a prime.

It is a congruent number.

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 2330 + ... + 2600.

It is an arithmetic number, because the mean of its divisors is an integer number (55080).

2⁶⁶⁸⁰¹⁵ is an apocalyptic number.

668015 is a deficient number, since it is larger than the sum of its proper divisors (213265).

668015 is a wasteful number, since it uses less digits than its factorization.

668015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 668015 is about 817.3218460313. The cubic root of 668015 is about 87.4169006969.

The spelling of 668015 in words is "six hundred sixty-eight thousand, fifteen".