666215000 has 80 divisors (see below), whose sum is σ = 1702986120. Its totient is φ = 242240000.

The previous prime is 666214981. The next prime is 666215059. The reversal of 666215000 is 512666.

666215000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48944 + ... + 61056.

Almost surely, 2^666215000 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 666215000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851493060).

666215000 is an abundant number, since it is smaller than the sum of its proper divisors (1036771120).

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

666215000 is a wasteful number, since it uses less digits than its factorization.

666215000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12150 (or 12131 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 666215000 is about 25811.1410053876. The cubic root of 666215000 is about 873.3831365780.

Adding to 666215000 its reverse (512666), we get a palindrome (666727666).

The spelling of 666215000 in words is "six hundred sixty-six million, two hundred fifteen thousand".