66154523680 has 144 divisors (see below), whose sum is σ = 185238287640. Its totient is φ = 22253457408.

The previous prime is 66154523671. The next prime is 66154523681. The reversal of 66154523680 is 8632545166.

It can be written as a sum of positive squares in 4 ways, for example, as 65940076944 + 214446736 = 256788^2 + 14644^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66154523680.

It is not an unprimeable number, because it can be changed into a prime (66154523681) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 335916 + ... + 495124.

Almost surely, 2^66154523680 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 66154523680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92619143820).

66154523680 is an abundant number, since it is smaller than the sum of its proper divisors (119083763960).

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

66154523680 is a wasteful number, since it uses less digits than its factorization.

66154523680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159291 (or 159276 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 66154523680 in words is "sixty-six billion, one hundred fifty-four million, five hundred twenty-three thousand, six hundred eighty".