666057672 has 96 divisors (see below), whose sum is σ = 2069383680. Its totient is φ = 189584640.

The previous prime is 666057629. The next prime is 666057677. The reversal of 666057672 is 276750666.

It is not an unprimeable number, because it can be changed into a prime (666057677) 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 23 ways as a sum of consecutive naturals, for example, 139273 + ... + 143975.

It is an arithmetic number, because the mean of its divisors is an integer number (21556080).

Almost surely, 2^666057672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666057672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1034691840).

666057672 is an abundant number, since it is smaller than the sum of its proper divisors (1403326008).

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

666057672 is a wasteful number, since it uses less digits than its factorization.

666057672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5003 (or 4996 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The square root of 666057672 is about 25808.0931492429. The cubic root of 666057672 is about 873.3143807760.

The spelling of 666057672 in words is "six hundred sixty-six million, fifty-seven thousand, six hundred seventy-two".