666464215232 has 112 divisors (see below), whose sum is σ = 1365717360000. Its totient is φ = 322536867840.

The previous prime is 666464215223. The next prime is 666464215267. The reversal of 666464215232 is 232512464666.

It is a super-3 number, since 3×666464215232³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 190471019 + ... + 190474517.

It is an arithmetic number, because the mean of its divisors is an integer number (12193905000).

Almost surely, 2^666464215232 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 666464215232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682858680000).

666464215232 is an abundant number, since it is smaller than the sum of its proper divisors (699253144768).

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

666464215232 is a wasteful number, since it uses less digits than its factorization.

666464215232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334 (or 4324 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 47.

Adding to 666464215232 its reverse (232512464666), we get a palindrome (898976679898).

The spelling of 666464215232 in words is "six hundred sixty-six billion, four hundred sixty-four million, two hundred fifteen thousand, two hundred thirty-two".