666033020 has 72 divisors (see below), whose sum is σ = 1465024176. Its totient is φ = 254161152.

The previous prime is 666032981. The next prime is 666033029. The reversal of 666033020 is 20330666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666033029) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 6466289 + ... + 6466391.

It is an arithmetic number, because the mean of its divisors is an integer number (20347558).

Almost surely, 2^666033020 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 666033020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732512088).

666033020 is an abundant number, since it is smaller than the sum of its proper divisors (798991156).

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

666033020 is a wasteful number, since it uses less digits than its factorization.

666033020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 666033020 is about 25807.6155427037. The cubic root of 666033020 is about 873.3036063278.

Adding to 666033020 its reverse (20330666), we get a palindrome (686363686).

The spelling of 666033020 in words is "six hundred sixty-six million, thirty-three thousand, twenty".