166569725280 has 384 divisors, whose sum is σ = 611784327168. Its totient is φ = 37310257152.

The previous prime is 166569725237. The next prime is 166569725291. The reversal of 166569725280 is 82527965661.

It is a self number, because there is not a number n which added to its sum of digits gives 166569725280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35415409 + ... + 35420111.

It is an arithmetic number, because the mean of its divisors is an integer number (1593188352).

Almost surely, 2^166569725280 is an apocalyptic number.

166569725280 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 166569725280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305892163584).

166569725280 is an abundant number, since it is smaller than the sum of its proper divisors (445214601888).

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

166569725280 is a wasteful number, since it uses less digits than its factorization.

166569725280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4938 (or 4930 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 57.

The spelling of 166569725280 in words is "one hundred sixty-six billion, five hundred sixty-nine million, seven hundred twenty-five thousand, two hundred eighty".