666637544600000 has 168 divisors, whose sum is σ = 1658853809529840. Its totient is φ = 265786410240000.

The previous prime is 666637544599993. The next prime is 666637544600077. The reversal of 666637544600000 is 6445736666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55971356 + ... + 66828644.

It is an arithmetic number, because the mean of its divisors is an integer number (9874129818630).

Almost surely, 2^{666637544600000} 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 666637544600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829426904764920).

666637544600000 is an abundant number, since it is smaller than the sum of its proper divisors (992216264929840).

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

666637544600000 is an equidigital number, since it uses as much as digits as its factorization.

666637544600000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10857633 (or 10857603 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 53.

The spelling of 666637544600000 in words is "six hundred sixty-six trillion, six hundred thirty-seven billion, five hundred forty-four million, six hundred thousand".