6368139985 has 4 divisors (see below), whose sum is σ = 7641767988. Its totient is φ = 5094511984.

The previous prime is 6368139983. The next prime is 6368140013. The reversal of 6368139985 is 5899318636.

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 826677504 + 5541462481 = 28752^2 + 74441^2 .

It is a cyclic number.

It is not a de Polignac number, because 6368139985 - 2¹ = 6368139983 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6368139983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636813994 + ... + 636814003.

It is an arithmetic number, because the mean of its divisors is an integer number (1910441997).

Almost surely, 2^6368139985 is an apocalyptic number.

It is an amenable number.

6368139985 is a deficient number, since it is larger than the sum of its proper divisors (1273628003).

6368139985 is a wasteful number, since it uses less digits than its factorization.

6368139985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273628002.

The product of its digits is 8398080, while the sum is 58.

The square root of 6368139985 is about 79800.6264699720. The cubic root of 6368139985 is about 1853.5495509226.

The spelling of 6368139985 in words is "six billion, three hundred sixty-eight million, one hundred thirty-nine thousand, nine hundred eighty-five".