66734522784 has 96 divisors (see below), whose sum is σ = 194823195840. Its totient is φ = 22224174336.

The previous prime is 66734522783. The next prime is 66734522891. The reversal of 66734522784 is 48722543766.

66734522784 is a `hidden beast` number, since 6 + 6 + 7 + 34 + 522 + 7 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×66734522784² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 66734522784.

It is not an unprimeable number, because it can be changed into a prime (66734522783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 909019 + ... + 979685.

It is an arithmetic number, because the mean of its divisors is an integer number (2029408290).

Almost surely, 2^66734522784 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 66734522784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97411597920).

66734522784 is an abundant number, since it is smaller than the sum of its proper divisors (128088673056).

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

66734522784 is a wasteful number, since it uses less digits than its factorization.

66734522784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71779 (or 71765 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 54.

The spelling of 66734522784 in words is "sixty-six billion, seven hundred thirty-four million, five hundred twenty-two thousand, seven hundred eighty-four".