6311981165 has 16 divisors (see below), whose sum is σ = 9112033920. Its totient is φ = 4100414400.

The previous prime is 6311981131. The next prime is 6311981171. The reversal of 6311981165 is 5611891136.

It is not a de Polignac number, because 6311981165 - 2¹⁰ = 6311980141 is a prime.

It is a super-2 number, since 2×6311981165² = 79682212454629514450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4745186 + ... + 4746515.

It is an arithmetic number, because the mean of its divisors is an integer number (569502120).

Almost surely, 2^6311981165 is an apocalyptic number.

It is an amenable number.

6311981165 is a deficient number, since it is larger than the sum of its proper divisors (2800052755).

6311981165 is a wasteful number, since it uses less digits than its factorization.

6311981165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9491732.

The product of its digits is 38880, while the sum is 41.

The square root of 6311981165 is about 79447.9777275671. The cubic root of 6311981165 is about 1848.0848127534.

The spelling of 6311981165 in words is "six billion, three hundred eleven million, nine hundred eighty-one thousand, one hundred sixty-five".