666948120 has 128 divisors (see below), whose sum is σ = 2040422400. Its totient is φ = 174375936.

The previous prime is 666948091. The next prime is 666948143. The reversal of 666948120 is 21849666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1630476 + ... + 1630884.

It is an arithmetic number, because the mean of its divisors is an integer number (15940800).

Almost surely, 2^666948120 is an apocalyptic number.

666948120 is a gapful number since it is divisible by the number (60) 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 666948120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020211200).

666948120 is an abundant number, since it is smaller than the sum of its proper divisors (1373474280).

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

666948120 is a wasteful number, since it uses less digits than its factorization.

666948120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 666948120 is about 25825.3387199471. The cubic root of 666948120 is about 873.7033835068.

The spelling of 666948120 in words is "six hundred sixty-six million, nine hundred forty-eight thousand, one hundred twenty".