669817512 has 320 divisors, whose sum is σ = 2379189120. Its totient is φ = 171320832.

The previous prime is 669817487. The next prime is 669817529. The reversal of 669817512 is 215718966.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2181663 + ... + 2181969.

It is an arithmetic number, because the mean of its divisors is an integer number (7434966).

Almost surely, 2^669817512 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 669817512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1189594560).

669817512 is an abundant number, since it is smaller than the sum of its proper divisors (1709371608).

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

669817512 is a wasteful number, since it uses less digits than its factorization.

669817512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 369 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 669817512 is about 25880.8329077717. The cubic root of 669817512 is about 874.9545606880.

The spelling of 669817512 in words is "six hundred sixty-nine million, eight hundred seventeen thousand, five hundred twelve".