666814480128 has 216 divisors, whose sum is σ = 2085339949056. Its totient is φ = 204093849600.

The previous prime is 666814480099. The next prime is 666814480159. The reversal of 666814480128 is 821084418666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 1398273 + ... + 1813503.

It is an arithmetic number, because the mean of its divisors is an integer number (9654351616).

Almost surely, 2^666814480128 is an apocalyptic number.

666814480128 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666814480128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1042669974528).

666814480128 is an abundant number, since it is smaller than the sum of its proper divisors (1418525468928).

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

666814480128 is a wasteful number, since it uses less digits than its factorization.

666814480128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415311 (or 415294 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 666814480128 in words is "six hundred sixty-six billion, eight hundred fourteen million, four hundred eighty thousand, one hundred twenty-eight".