166664680 has 192 divisors, whose sum is σ = 487226880. Its totient is φ = 50803200.

The previous prime is 166664677. The next prime is 166664681. The reversal of 166664680 is 86466661.

It is not an unprimeable number, because it can be changed into a prime (166664681) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 789775 + ... + 789985.

It is an arithmetic number, because the mean of its divisors is an integer number (2537640).

Almost surely, 2^166664680 is an apocalyptic number.

166664680 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 166664680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243613440).

166664680 is an abundant number, since it is smaller than the sum of its proper divisors (320562200).

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

166664680 is a wasteful number, since it uses less digits than its factorization.

166664680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 166664680 is about 12909.8675438596. The cubic root of 166664680 is about 550.3190215308.

The spelling of 166664680 in words is "one hundred sixty-six million, six hundred sixty-four thousand, six hundred eighty".