6809041557 has 6 divisors (see below), whose sum is σ = 9835282262. Its totient is φ = 4539361032.

The previous prime is 6809041549. The next prime is 6809041559. The reversal of 6809041557 is 7551409086.

6809041557 is a `hidden beast` number, since 6 + 8 + 0 + 90 + 4 + 1 + 557 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4776744996 + 2032296561 = 69114^2 + 45081^2 .

It is not a de Polignac number, because 6809041557 - 2³ = 6809041549 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 (6809041559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 378280078 + ... + 378280095.

Almost surely, 2^6809041557 is an apocalyptic number.

It is an amenable number.

6809041557 is a deficient number, since it is larger than the sum of its proper divisors (3026240705).

6809041557 is a wasteful number, since it uses less digits than its factorization.

6809041557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756560179 (or 756560176 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 6809041557 is about 82516.9167928613. The cubic root of 6809041557 is about 1895.3757867773.

The spelling of 6809041557 in words is "six billion, eight hundred nine million, forty-one thousand, five hundred fifty-seven".