6557849065 has 4 divisors (see below), whose sum is σ = 7869418884. Its totient is φ = 5246279248.

The previous prime is 6557849047. The next prime is 6557849087. The reversal of 6557849065 is 5609487556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2488812544 + 4069036521 = 49888^2 + 63789^2 .

It is a cyclic number.

It is not a de Polignac number, because 6557849065 - 2⁷ = 6557848937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6557848997 and 6557849015.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 655784902 + ... + 655784911.

It is an arithmetic number, because the mean of its divisors is an integer number (1967354721).

Almost surely, 2^6557849065 is an apocalyptic number.

It is an amenable number.

6557849065 is a deficient number, since it is larger than the sum of its proper divisors (1311569819).

6557849065 is a wasteful number, since it uses less digits than its factorization.

6557849065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311569818.

The product of its (nonzero) digits is 9072000, while the sum is 55.

The square root of 6557849065 is about 80980.5474481372. The cubic root of 6557849065 is about 1871.7757032787.

The spelling of 6557849065 in words is "six billion, five hundred fifty-seven million, eight hundred forty-nine thousand, sixty-five".