64785530218864 has 480 divisors, whose sum is σ = 163875669619200. Its totient is φ = 24773851275264.

The previous prime is 64785530218789. The next prime is 64785530218883. The reversal of 64785530218864 is 46881203558746.

It is a happy number.

64785530218864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 64785530218864.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3868477339 + ... + 3868494085.

It is an arithmetic number, because the mean of its divisors is an integer number (341407645040).

Almost surely, 2^{64785530218864} 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 64785530218864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81937834809600).

64785530218864 is an abundant number, since it is smaller than the sum of its proper divisors (99090139400336).

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

64785530218864 is a wasteful number, since it uses less digits than its factorization.

64785530218864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16942 (or 16909 counting only the distinct ones).

The product of its (nonzero) digits is 309657600, while the sum is 67.

The spelling of 64785530218864 in words is "sixty-four trillion, seven hundred eighty-five billion, five hundred thirty million, two hundred eighteen thousand, eight hundred sixty-four".