669523616 has 48 divisors (see below), whose sum is σ = 1364122368. Its totient is φ = 323136000.

The previous prime is 669523607. The next prime is 669523633. The reversal of 669523616 is 616325966.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 595631 + ... + 596753.

It is an arithmetic number, because the mean of its divisors is an integer number (28419216).

Almost surely, 2^669523616 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 669523616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682061184).

669523616 is an abundant number, since it is smaller than the sum of its proper divisors (694598752).

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

669523616 is a wasteful number, since it uses less digits than its factorization.

669523616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765 (or 1757 counting only the distinct ones).

The product of its digits is 349920, while the sum is 44.

The square root of 669523616 is about 25875.1544149982. The cubic root of 669523616 is about 874.8265739556.

The spelling of 669523616 in words is "six hundred sixty-nine million, five hundred twenty-three thousand, six hundred sixteen".