669914856 has 96 divisors (see below), whose sum is σ = 1958622120. Its totient is φ = 205632000.

The previous prime is 669914807. The next prime is 669914857. The reversal of 669914856 is 658419966.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 593701956 + 76212900 = 24366^2 + 8730^2 .

It is not an unprimeable number, because it can be changed into a prime (669914857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 655626 + ... + 656646.

Almost surely, 2^669914856 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 669914856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979311060).

669914856 is an abundant number, since it is smaller than the sum of its proper divisors (1288707264).

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

669914856 is a wasteful number, since it uses less digits than its factorization.

669914856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747 (or 1740 counting only the distinct ones).

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

The square root of 669914856 is about 25882.7134589865. The cubic root of 669914856 is about 874.9969440982.

The spelling of 669914856 in words is "six hundred sixty-nine million, nine hundred fourteen thousand, eight hundred fifty-six".