66728224836 has 72 divisors (see below), whose sum is σ = 207598931904. Its totient is φ = 17598651840.

The previous prime is 66728224733. The next prime is 66728224853. The reversal of 66728224836 is 63842282766.

66728224836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10181130 + ... + 10187681.

Almost surely, 2^66728224836 is an apocalyptic number.

It is an amenable number.

66728224836 is an abundant number, since it is smaller than the sum of its proper divisors (140870707068).

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

66728224836 is a wasteful number, since it uses less digits than its factorization.

66728224836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20368841 (or 20368836 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 54.

The spelling of 66728224836 in words is "sixty-six billion, seven hundred twenty-eight million, two hundred twenty-four thousand, eight hundred thirty-six".