669818880 has 336 divisors, whose sum is σ = 2453518080. Its totient is φ = 168689664.

The previous prime is 669818879. The next prime is 669818911. The reversal of 669818880 is 88818966.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8478681 + ... + 8478759.

Almost surely, 2^669818880 is an apocalyptic number.

669818880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669818880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1226759040).

669818880 is an abundant number, since it is smaller than the sum of its proper divisors (1783699200).

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

669818880 is a wasteful number, since it uses less digits than its factorization.

669818880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The square root of 669818880 is about 25880.8593365831. The cubic root of 669818880 is about 874.9551563413.

The spelling of 669818880 in words is "six hundred sixty-nine million, eight hundred eighteen thousand, eight hundred eighty".