666336543264000 has 2304 divisors, whose sum is σ = 2848250384179200. Its totient is φ = 150269644800000.

The previous prime is 666336543263983. The next prime is 666336543264017. The reversal of 666336543264000 is 462345633666.

It is an interprime number because it is at equal distance from previous prime (666336543263983) and next prime (666336543264017).

It is a tau number, because it is divible by the number of its divisors (2304).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 165467229987 + ... + 165467234013.

It is an arithmetic number, because the mean of its divisors is an integer number (1236219784800).

Almost surely, 2^{666336543264000} is an apocalyptic number.

666336543264000 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 666336543264000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1424125192089600).

666336543264000 is an abundant number, since it is smaller than the sum of its proper divisors (2181913840915200).

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

666336543264000 is a wasteful number, since it uses less digits than its factorization.

666336543264000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4434 (or 4404 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 54.

Adding to 666336543264000 its reverse (462345633666), we get a palindrome (666798888897666).

The spelling of 666336543264000 in words is "six hundred sixty-six trillion, three hundred thirty-six billion, five hundred forty-three million, two hundred sixty-four thousand".