65980542891648 has 1024 divisors, whose sum is σ = 241910090956800. Its totient is φ = 15415407820800.

The previous prime is 65980542891547. The next prime is 65980542891649. The reversal of 65980542891648 is 84619824508956.

It is a self number, because there is not a number n which added to its sum of digits gives 65980542891648.

It is not an unprimeable number, because it can be changed into a prime (65980542891649) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 922988515 + ... + 923059997.

It is an arithmetic number, because the mean of its divisors is an integer number (236240323200).

Almost surely, 2^{65980542891648} 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 65980542891648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120955045478400).

65980542891648 is an abundant number, since it is smaller than the sum of its proper divisors (175929548065152).

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

65980542891648 is a wasteful number, since it uses less digits than its factorization.

65980542891648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71621 (or 71609 counting only the distinct ones).

The product of its (nonzero) digits is 1194393600, while the sum is 75.

The spelling of 65980542891648 in words is "sixty-five trillion, nine hundred eighty billion, five hundred forty-two million, eight hundred ninety-one thousand, six hundred forty-eight".