66568854889 has 4 divisors (see below), whose sum is σ = 66655421140. Its totient is φ = 66482288640.

The previous prime is 66568854823. The next prime is 66568854899. The reversal of 66568854889 is 98845886566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12462373225 + 54106481664 = 111635^2 + 232608^2 .

It is a cyclic number.

It is not a de Polignac number, because 66568854889 - 2⁹ = 66568854377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66568854899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43281972 + ... + 43283509.

It is an arithmetic number, because the mean of its divisors is an integer number (16663855285).

Almost surely, 2^66568854889 is an apocalyptic number.

It is an amenable number.

66568854889 is a deficient number, since it is larger than the sum of its proper divisors (86566251).

66568854889 is an equidigital number, since it uses as much as digits as its factorization.

66568854889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86566250.

The product of its digits is 796262400, while the sum is 73.

The spelling of 66568854889 in words is "sixty-six billion, five hundred sixty-eight million, eight hundred fifty-four thousand, eight hundred eighty-nine".