669541969008 has 320 divisors, whose sum is σ = 2123478374400. Its totient is φ = 200292618240.

The previous prime is 669541969003. The next prime is 669541969069. The reversal of 669541969008 is 800969145966.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669541969001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 504552441 + ... + 504553767.

It is an arithmetic number, because the mean of its divisors is an integer number (6635869920).

Almost surely, 2^669541969008 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 669541969008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1061739187200).

669541969008 is an abundant number, since it is smaller than the sum of its proper divisors (1453936405392).

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

669541969008 is a wasteful number, since it uses less digits than its factorization.

669541969008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2637 (or 2625 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

It can be divided in two parts, 6695 and 41969008, that added together give a triangular number (41975703 = T₉₁₆₂).

The spelling of 669541969008 in words is "six hundred sixty-nine billion, five hundred forty-one million, nine hundred sixty-nine thousand, eight".