166866812580 has 384 divisors, whose sum is σ = 551626790400. Its totient is φ = 37316837376.

The previous prime is 166866812573. The next prime is 166866812621. The reversal of 166866812580 is 85218668661.

It is a happy number.

166866812580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 166866812580.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 67474224 + ... + 67476696.

It is an arithmetic number, because the mean of its divisors is an integer number (1436528100).

Almost surely, 2^166866812580 is an apocalyptic number.

166866812580 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 166866812580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275813395200).

166866812580 is an abundant number, since it is smaller than the sum of its proper divisors (384759977820).

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

166866812580 is a wasteful number, since it uses less digits than its factorization.

166866812580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703 (or 2701 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 57.

The spelling of 166866812580 in words is "one hundred sixty-six billion, eight hundred sixty-six million, eight hundred twelve thousand, five hundred eighty".