6807378557 has 12 divisors (see below), whose sum is σ = 7964570556. Its totient is φ = 5801160960.

The previous prime is 6807378533. The next prime is 6807378569. The reversal of 6807378557 is 7558737086.

It can be written as a sum of positive squares in 2 ways, for example, as 6613918276 + 193460281 = 81326^2 + 13909^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6807378557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6807378587) 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 11 ways as a sum of consecutive naturals, for example, 393044 + ... + 409997.

It is an arithmetic number, because the mean of its divisors is an integer number (663714213).

Almost surely, 2^6807378557 is an apocalyptic number.

It is an amenable number.

6807378557 is a deficient number, since it is larger than the sum of its proper divisors (1157191999).

6807378557 is a wasteful number, since it uses less digits than its factorization.

6807378557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803228 (or 803221 counting only the distinct ones).

The product of its (nonzero) digits is 9878400, while the sum is 56.

The square root of 6807378557 is about 82506.8394558900. The cubic root of 6807378557 is about 1895.2214690929.

The spelling of 6807378557 in words is "six billion, eight hundred seven million, three hundred seventy-eight thousand, five hundred fifty-seven".