6544522821 has 4 divisors (see below), whose sum is σ = 8726030432. Its totient is φ = 4363015212.

The previous prime is 6544522807. The next prime is 6544522837. The reversal of 6544522821 is 1282254456.

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 not a de Polignac number, because 6544522821 - 2⁶ = 6544522757 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 6544522821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6544522891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090753801 + ... + 1090753806.

It is an arithmetic number, because the mean of its divisors is an integer number (2181507608).

Almost surely, 2^6544522821 is an apocalyptic number.

It is an amenable number.

6544522821 is a deficient number, since it is larger than the sum of its proper divisors (2181507611).

6544522821 is a wasteful number, since it uses less digits than its factorization.

6544522821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181507610.

The product of its digits is 153600, while the sum is 39.

The square root of 6544522821 is about 80898.2250794169. The cubic root of 6544522821 is about 1870.5069613129.

The spelling of 6544522821 in words is "six billion, five hundred forty-four million, five hundred twenty-two thousand, eight hundred twenty-one".