666482019840 has 960 divisors, whose sum is σ = 2864392667136. Its totient is φ = 139457396736.

The previous prime is 666482019809. The next prime is 666482019857. The reversal of 666482019840 is 48910284666.

It is a tau number, because it is divible by the number of its divisors (960).

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 95 ways as a sum of consecutive naturals, for example, 266272029 + ... + 266274531.

Almost surely, 2^666482019840 is an apocalyptic number.

666482019840 is a gapful number since it is divisible by the number (60) 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 666482019840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1432196333568).

666482019840 is an abundant number, since it is smaller than the sum of its proper divisors (2197910647296).

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

666482019840 is a wasteful number, since it uses less digits than its factorization.

666482019840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679 (or 2660 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 666482019840 in words is "six hundred sixty-six billion, four hundred eighty-two million, nineteen thousand, eight hundred forty".