665144886080 has 112 divisors (see below), whose sum is σ = 1612247646720. Its totient is φ = 261327126528.

The previous prime is 665144886053. The next prime is 665144886097. The reversal of 665144886080 is 80688441566.

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 15 ways as a sum of consecutive naturals, for example, 4810877 + ... + 4947203.

Almost surely, 2^665144886080 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 665144886080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806123823360).

665144886080 is an abundant number, since it is smaller than the sum of its proper divisors (947102760640).

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

665144886080 is a wasteful number, since it uses less digits than its factorization.

665144886080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136616 (or 136606 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 56.

It can be divided in two parts, 66514 and 4886080, that added together give a palindrome (4952594).

The spelling of 665144886080 in words is "six hundred sixty-five billion, one hundred forty-four million, eight hundred eighty-six thousand, eighty".