666411996 has 48 divisors (see below), whose sum is σ = 1616832000. Its totient is φ = 213377472.

The previous prime is 666411973. The next prime is 666412001. The reversal of 666411996 is 699114666.

It is a congruent number.

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, 64441 + ... + 74063.

It is an arithmetic number, because the mean of its divisors is an integer number (33684000).

Almost surely, 2^666411996 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 666411996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (808416000).

666411996 is an abundant number, since it is smaller than the sum of its proper divisors (950420004).

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

666411996 is a wasteful number, since it uses less digits than its factorization.

666411996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9858 (or 9856 counting only the distinct ones).

The product of its digits is 419904, while the sum is 48.

The square root of 666411996 is about 25814.9568273898. The cubic root of 666411996 is about 873.4692129091.

The spelling of 666411996 in words is "six hundred sixty-six million, four hundred eleven thousand, nine hundred ninety-six".