166569984000 has 720 divisors, whose sum is σ = 686842455936. Its totient is φ = 38043648000.

The previous prime is 166569983981. The next prime is 166569984041. The reversal of 166569984000 is 489965661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (720).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129023355 + ... + 129024645.

Almost surely, 2^166569984000 is an apocalyptic number.

166569984000 is a gapful number since it is divisible by the number (10) 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 166569984000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343421227968).

166569984000 is an abundant number, since it is smaller than the sum of its proper divisors (520272471936).

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

166569984000 is an equidigital number, since it uses as much as digits as its factorization.

166569984000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347 (or 1308 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 166569984000 in words is "one hundred sixty-six billion, five hundred sixty-nine million, nine hundred eighty-four thousand".