66356588728 has 48 divisors (see below), whose sum is σ = 130133984760. Its totient is φ = 31716720000.

The previous prime is 66356588719. The next prime is 66356588807. The reversal of 66356588728 is 82788565366.

66356588728 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 66356588728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 630703 + ... + 728353.

Almost surely, 2^66356588728 is an apocalyptic number.

It is an amenable number.

66356588728 is a deficient number, since it is larger than the sum of its proper divisors (63777396032).

66356588728 is a wasteful number, since it uses less digits than its factorization.

66356588728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97816 (or 97783 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 64.

It can be divided in two parts, 66356588 and 728, that added together give a square (66357316 = 8146²).

The spelling of 66356588728 in words is "sixty-six billion, three hundred fifty-six million, five hundred eighty-eight thousand, seven hundred twenty-eight".