66728385859 has 2 divisors, whose sum is σ = 66728385860. Its totient is φ = 66728385858.

The previous prime is 66728385797. The next prime is 66728385917. The reversal of 66728385859 is 95858382766.

66728385859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66728385859 - 2¹¹ = 66728383811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66728385794 and 66728385803.

It is not a weakly prime, because it can be changed into another prime (66728385959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33364192929 + 33364192930.

It is an arithmetic number, because the mean of its divisors is an integer number (33364192930).

Almost surely, 2^66728385859 is an apocalyptic number.

66728385859 is a deficient number, since it is larger than the sum of its proper divisors (1).

66728385859 is an equidigital number, since it uses as much as digits as its factorization.

66728385859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174182400, while the sum is 67.

The spelling of 66728385859 in words is "sixty-six billion, seven hundred twenty-eight million, three hundred eighty-five thousand, eight hundred fifty-nine".