6543862849 has 4 divisors (see below), whose sum is σ = 6544039936. Its totient is φ = 6543685764.

The previous prime is 6543862837. The next prime is 6543862877. The reversal of 6543862849 is 9482683456.

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 6543862849 - 2⁹ = 6543862337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6543862849.

It is not an unprimeable number, because it can be changed into a prime (6543862889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9729 + ... + 114814.

It is an arithmetic number, because the mean of its divisors is an integer number (1636009984).

Almost surely, 2^6543862849 is an apocalyptic number.

It is an amenable number.

6543862849 is a deficient number, since it is larger than the sum of its proper divisors (177087).

6543862849 is a wasteful number, since it uses less digits than its factorization.

6543862849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177086.

The product of its digits is 9953280, while the sum is 55.

The square root of 6543862849 is about 80894.1459501242. The cubic root of 6543862849 is about 1870.4440830989. Note that the first 3 decimals are identical.

The spelling of 6543862849 in words is "six billion, five hundred forty-three million, eight hundred sixty-two thousand, eight hundred forty-nine".