6900081813 has 6 divisors (see below), whose sum is σ = 9966784854. Its totient is φ = 4600054536.

The previous prime is 6900081809. The next prime is 6900081841. The reversal of 6900081813 is 3181800096.

It can be written as a sum of positive squares in only one way, i.e., 6473328849 + 426752964 = 80457^2 + 20658^2 .

It is not a de Polignac number, because 6900081813 - 2² = 6900081809 is a prime.

It is a super-2 number, since 2×6900081813² = 95222258052186733938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6900081883) 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 5 ways as a sum of consecutive naturals, for example, 383337870 + ... + 383337887.

It is an arithmetic number, because the mean of its divisors is an integer number (1661130809).

Almost surely, 2^6900081813 is an apocalyptic number.

It is an amenable number.

6900081813 is a deficient number, since it is larger than the sum of its proper divisors (3066703041).

6900081813 is a wasteful number, since it uses less digits than its factorization.

6900081813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766675763 (or 766675760 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 6900081813 is about 83066.7310841109. The cubic root of 6900081813 is about 1903.7857862723.

The spelling of 6900081813 in words is "six billion, nine hundred million, eighty-one thousand, eight hundred thirteen".