669064965440 has 224 divisors, whose sum is σ = 1645261632000. Its totient is φ = 259045394432.

The previous prime is 669064965421. The next prime is 669064965473. The reversal of 669064965440 is 44569460966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a self number, because there is not a number n which added to its sum of digits gives 669064965440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 656589251 + ... + 656590269.

It is an arithmetic number, because the mean of its divisors is an integer number (7344918000).

Almost surely, 2^669064965440 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 669064965440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822630816000).

669064965440 is an abundant number, since it is smaller than the sum of its proper divisors (976196666560).

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

669064965440 is a wasteful number, since it uses less digits than its factorization.

669064965440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597 (or 1587 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 59.

The spelling of 669064965440 in words is "six hundred sixty-nine billion, sixty-four million, nine hundred sixty-five thousand, four hundred forty".