669459168 has 288 divisors, whose sum is σ = 2311545600. Its totient is φ = 190512000.

The previous prime is 669459163. The next prime is 669459169. The reversal of 669459168 is 861954966.

It is a happy number.

669459168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669459163) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2667043 + ... + 2667293.

It is an arithmetic number, because the mean of its divisors is an integer number (8026200).

Almost surely, 2^669459168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669459168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1155772800).

669459168 is an abundant number, since it is smaller than the sum of its proper divisors (1642086432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669459168 is an equidigital number, since it uses as much as digits as its factorization.

669459168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 263 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 669459168 is about 25873.9090204785. The cubic root of 669459168 is about 874.7985029357.

The spelling of 669459168 in words is "six hundred sixty-nine million, four hundred fifty-nine thousand, one hundred sixty-eight".