665105547656000 has 448 divisors, whose sum is σ = 1827906174731520. Its totient is φ = 237682181120000.

The previous prime is 665105547655999. The next prime is 665105547656063. The reversal of 665105547656000 is 656745501566.

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 (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17969493494 + ... + 17969530506.

Almost surely, 2^{665105547656000} 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 665105547656000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913953087365760).

665105547656000 is an abundant number, since it is smaller than the sum of its proper divisors (1162800627075520).

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

665105547656000 is a wasteful number, since it uses less digits than its factorization.

665105547656000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40571 (or 40551 counting only the distinct ones).

The product of its (nonzero) digits is 22680000, while the sum is 56.

The spelling of 665105547656000 in words is "six hundred sixty-five trillion, one hundred five billion, five hundred forty-seven million, six hundred fifty-six thousand".