669320985600 has 396 divisors, whose sum is σ = 2399324399680. Its totient is φ = 178274304000.

The previous prime is 669320985583. The next prime is 669320985601. The reversal of 669320985600 is 6589023966.

669320985600 is a `hidden beast` number, since 6 + 6 + 9 + 3 + 20 + 9 + 8 + 5 + 600 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669320985601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 343064625 + ... + 343066575.

Almost surely, 2^669320985600 is an apocalyptic number.

669320985600 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 669320985600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1199662199840).

669320985600 is an abundant number, since it is smaller than the sum of its proper divisors (1730003414080).

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

669320985600 is a wasteful number, since it uses less digits than its factorization.

669320985600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3476 (or 3450 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 669320985600 in words is "six hundred sixty-nine billion, three hundred twenty million, nine hundred eighty-five thousand, six hundred".