6648889549 has 4 divisors (see below), whose sum is σ = 6728996736. Its totient is φ = 6568782364.

The previous prime is 6648889523. The next prime is 6648889553. The reversal of 6648889549 is 9459888466.

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 6648889549 - 2¹¹ = 6648887501 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 (6648889589) 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, 40053469 + ... + 40053634.

It is an arithmetic number, because the mean of its divisors is an integer number (1682249184).

Almost surely, 2^6648889549 is an apocalyptic number.

It is an amenable number.

6648889549 is a deficient number, since it is larger than the sum of its proper divisors (80107187).

6648889549 is an equidigital number, since it uses as much as digits as its factorization.

6648889549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80107186.

The product of its digits is 119439360, while the sum is 67.

The square root of 6648889549 is about 81540.7232553158. The cubic root of 6648889549 is about 1880.3976777751.

The spelling of 6648889549 in words is "six billion, six hundred forty-eight million, eight hundred eighty-nine thousand, five hundred forty-nine".