6995816881 has 3 divisors (see below), whose sum is σ = 6995900523. Its totient is φ = 6995733240.

The previous prime is 6995816879. The next prime is 6995816899. The reversal of 6995816881 is 1886185996.

The square root of 6995816881 is 83641.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 167281 + 6995649600 = 409^2 + 83640^2 .

It is not a de Polignac number, because 6995816881 - 2¹ = 6995816879 is a prime.

It is a super-2 number, since 2×6995816881² = 97882907664969136322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6995816281) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 41821 + ... + 125461.

It is an arithmetic number, because the mean of its divisors is an integer number (2331966841).

Almost surely, 2^6995816881 is an apocalyptic number.

6995816881 is the 83641-st square number.

6995816881 is the 41821-st centered octagonal number.

It is an amenable number.

6995816881 is a deficient number, since it is larger than the sum of its proper divisors (83642).

6995816881 is an frugal number, since it uses more digits than its factorization.

6995816881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167282 (or 83641 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 61.

The cubic root of 6995816881 is about 1912.5500583306.

The spelling of 6995816881 in words is "six billion, nine hundred ninety-five million, eight hundred sixteen thousand, eight hundred eighty-one".