6813868137 has 4 divisors (see below), whose sum is σ = 9085157520. Its totient is φ = 4542578756.

The previous prime is 6813868129. The next prime is 6813868157. The reversal of 6813868137 is 7318683186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6813868137 - 2³ = 6813868129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6813868137.

It is not an unprimeable number, because it can be changed into a prime (6813868157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1135644687 + ... + 1135644692.

It is an arithmetic number, because the mean of its divisors is an integer number (2271289380).

Almost surely, 2^6813868137 is an apocalyptic number.

It is an amenable number.

6813868137 is a deficient number, since it is larger than the sum of its proper divisors (2271289383).

6813868137 is a wasteful number, since it uses less digits than its factorization.

6813868137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271289382.

The product of its digits is 1161216, while the sum is 51.

The square root of 6813868137 is about 82546.1576149974. The cubic root of 6813868137 is about 1895.8235258646.

The spelling of 6813868137 in words is "six billion, eight hundred thirteen million, eight hundred sixty-eight thousand, one hundred thirty-seven".