66547761936 has 80 divisors (see below), whose sum is σ = 172912742400. Its totient is φ = 22054032000.

The previous prime is 66547761901. The next prime is 66547761949. The reversal of 66547761936 is 63916774566.

66547761936 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 66547761936.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20468311 + ... + 20471561.

It is an arithmetic number, because the mean of its divisors is an integer number (2161409280).

Almost surely, 2^66547761936 is an apocalyptic number.

It is an amenable number.

66547761936 is an abundant number, since it is smaller than the sum of its proper divisors (106364980464).

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

66547761936 is a wasteful number, since it uses less digits than its factorization.

66547761936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5604 (or 5598 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 60.

The spelling of 66547761936 in words is "sixty-six billion, five hundred forty-seven million, seven hundred sixty-one thousand, nine hundred thirty-six".