6311568985 has 4 divisors (see below), whose sum is σ = 7573882788. Its totient is φ = 5049255184.

The previous prime is 6311568983. The next prime is 6311568997. The reversal of 6311568985 is 5898651136.

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 3057094681 + 3254474304 = 55291^2 + 57048^2 .

It is a cyclic number.

It is not a de Polignac number, because 6311568985 - 2¹ = 6311568983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6311568983) 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, 631156894 + ... + 631156903.

It is an arithmetic number, because the mean of its divisors is an integer number (1893470697).

Almost surely, 2^6311568985 is an apocalyptic number.

It is an amenable number.

6311568985 is a deficient number, since it is larger than the sum of its proper divisors (1262313803).

6311568985 is a wasteful number, since it uses less digits than its factorization.

6311568985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262313802.

The product of its digits is 1555200, while the sum is 52.

The square root of 6311568985 is about 79445.3836607263. The cubic root of 6311568985 is about 1848.0445844870.

The spelling of 6311568985 in words is "six billion, three hundred eleven million, five hundred sixty-eight thousand, nine hundred eighty-five".