166066780 has 48 divisors (see below), whose sum is σ = 383040000. Its totient is φ = 59976000.

The previous prime is 166066759. The next prime is 166066781. The reversal of 166066780 is 87660661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166066781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30721 + ... + 35719.

It is an arithmetic number, because the mean of its divisors is an integer number (7980000).

Almost surely, 2^166066780 is an apocalyptic number.

166066780 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 166066780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191520000).

166066780 is an abundant number, since it is smaller than the sum of its proper divisors (216973220).

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

166066780 is a wasteful number, since it uses less digits than its factorization.

166066780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5170 (or 5168 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 166066780 is about 12886.6900327431. The cubic root of 166066780 is about 549.6601536878.

The spelling of 166066780 in words is "one hundred sixty-six million, sixty-six thousand, seven hundred eighty".