66680178824 has 96 divisors (see below), whose sum is σ = 153251020800. Its totient is φ = 27045083520.

The previous prime is 66680178797. The next prime is 66680178827. The reversal of 66680178824 is 42887108666.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a self number, because there is not a number n which added to its sum of digits gives 66680178824.

It is not an unprimeable number, because it can be changed into a prime (66680178827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8136569 + ... + 8144759.

It is an arithmetic number, because the mean of its divisors is an integer number (1596364800).

Almost surely, 2^66680178824 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 66680178824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76625510400).

66680178824 is an abundant number, since it is smaller than the sum of its proper divisors (86570841976).

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

66680178824 is a wasteful number, since it uses less digits than its factorization.

66680178824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323 (or 9312 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 66680178824 in words is "sixty-six billion, six hundred eighty million, one hundred seventy-eight thousand, eight hundred twenty-four".