669544896 has 84 divisors (see below), whose sum is σ = 1825328328. Its totient is φ = 216442368.

The previous prime is 669544871. The next prime is 669544943. The reversal of 669544896 is 698445966.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2180775 + ... + 2181081.

Almost surely, 2^669544896 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 669544896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (912664164).

669544896 is an abundant number, since it is smaller than the sum of its proper divisors (1155783432).

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

669544896 is an equidigital number, since it uses as much as digits as its factorization.

669544896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 349 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 57.

The square root of 669544896 is about 25875.5656170063. The cubic root of 669544896 is about 874.8358422929.

The spelling of 669544896 in words is "six hundred sixty-nine million, five hundred forty-four thousand, eight hundred ninety-six".