669469444672 has 168 divisors, whose sum is σ = 1568998233600. Its totient is φ = 282548238336.

The previous prime is 669469444661. The next prime is 669469444687. The reversal of 669469444672 is 276444964966.

It is a junction number, because it is equal to n+sod(n) for n = 669469444598 and 669469444607.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101323993 + ... + 101330599.

It is an arithmetic number, because the mean of its divisors is an integer number (9339275200).

Almost surely, 2^669469444672 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 669469444672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784499116800).

669469444672 is an abundant number, since it is smaller than the sum of its proper divisors (899528788928).

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

669469444672 is a wasteful number, since it uses less digits than its factorization.

669469444672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7121 (or 7104 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 67.

The spelling of 669469444672 in words is "six hundred sixty-nine billion, four hundred sixty-nine million, four hundred forty-four thousand, six hundred seventy-two".