666620200 has 96 divisors (see below), whose sum is σ = 1593837720. Its totient is φ = 259200000.

The previous prime is 666620197. The next prime is 666620203. The reversal of 666620200 is 2026666.

It is an interprime number because it is at equal distance from previous prime (666620197) and next prime (666620203).

It can be written as a sum of positive squares in 12 ways, for example, as 23794884 + 642825316 = 4878^2 + 25354^2 .

It is not an unprimeable number, because it can be changed into a prime (666620203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1231930 + ... + 1232470.

Almost surely, 2^666620200 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 666620200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (796918860).

666620200 is an abundant number, since it is smaller than the sum of its proper divisors (927217520).

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

666620200 is a wasteful number, since it uses less digits than its factorization.

666620200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719 (or 710 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 666620200 is about 25818.9891359054. The cubic root of 666620200 is about 873.5601680786.

Adding to 666620200 its reverse (2026666), we get a palindrome (668646866).

It can be divided in two parts, 66 and 6620200, that added together give a palindrome (6620266).

The spelling of 666620200 in words is "six hundred sixty-six million, six hundred twenty thousand, two hundred".