6813847557 has 24 divisors (see below), whose sum is σ = 10739645280. Its totient is φ = 4128576480.

The previous prime is 6813847549. The next prime is 6813847657. The reversal of 6813847557 is 7557483186.

It is a happy number.

6813847557 is a `hidden beast` number, since 6 + 8 + 1 + 3 + 84 + 7 + 557 = 666.

It is not a de Polignac number, because 6813847557 - 2³ = 6813847549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6813847057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 630919 + ... + 641627.

It is an arithmetic number, because the mean of its divisors is an integer number (447485220).

Almost surely, 2^6813847557 is an apocalyptic number.

It is an amenable number.

6813847557 is a deficient number, since it is larger than the sum of its proper divisors (3925797723).

6813847557 is a wasteful number, since it uses less digits than its factorization.

6813847557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17153 (or 17150 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The square root of 6813847557 is about 82546.0329573748. The cubic root of 6813847557 is about 1895.8216172039.

The spelling of 6813847557 in words is "six billion, eight hundred thirteen million, eight hundred forty-seven thousand, five hundred fifty-seven".