68445428866 has 24 divisors (see below), whose sum is σ = 110187146916. Its totient is φ = 31877529600.

The previous prime is 68445428861. The next prime is 68445428873. The reversal of 68445428866 is 66882454486.

It can be written as a sum of positive squares in 6 ways, for example, as 52260246025 + 16185182841 = 228605^2 + 127221^2 .

It is not an unprimeable number, because it can be changed into a prime (68445428861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 554335 + ... + 666466.

Almost surely, 2^68445428866 is an apocalyptic number.

68445428866 is a deficient number, since it is larger than the sum of its proper divisors (41741718050).

68445428866 is a wasteful number, since it uses less digits than its factorization.

68445428866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220934 (or 1220917 counting only the distinct ones).

The product of its digits is 70778880, while the sum is 61.

The spelling of 68445428866 in words is "sixty-eight billion, four hundred forty-five million, four hundred twenty-eight thousand, eight hundred sixty-six".