668531829 has 16 divisors (see below), whose sum is σ = 1033922048. Its totient is φ = 376315632.

The previous prime is 668531821. The next prime is 668531839. The reversal of 668531829 is 928135866.

It is a happy number.

It is not a de Polignac number, because 668531829 - 2³ = 668531821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668531821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236167 + ... + 238980.

It is an arithmetic number, because the mean of its divisors is an integer number (64620128).

Almost surely, 2^668531829 is an apocalyptic number.

It is an amenable number.

668531829 is a deficient number, since it is larger than the sum of its proper divisors (365390219).

668531829 is a wasteful number, since it uses less digits than its factorization.

668531829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475224.

The product of its digits is 622080, while the sum is 48.

The square root of 668531829 is about 25855.9824605448. The cubic root of 668531829 is about 874.3943908444.

The spelling of 668531829 in words is "six hundred sixty-eight million, five hundred thirty-one thousand, eight hundred twenty-nine".