6648644663 has 4 divisors (see below), whose sum is σ = 6828337800. Its totient is φ = 6468951528.

The previous prime is 6648644657. The next prime is 6648644677. The reversal of 6648644663 is 3664468466.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6648644663 - 2⁶ = 6648644599 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 (6648644623) 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, 89846513 + ... + 89846586.

It is an arithmetic number, because the mean of its divisors is an integer number (1707084450).

Almost surely, 2^6648644663 is an apocalyptic number.

6648644663 is a deficient number, since it is larger than the sum of its proper divisors (179693137).

6648644663 is a wasteful number, since it uses less digits than its factorization.

6648644663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179693136.

The product of its digits is 11943936, while the sum is 53.

The square root of 6648644663 is about 81539.2216237070. The cubic root of 6648644663 is about 1880.3745917787.

The spelling of 6648644663 in words is "six billion, six hundred forty-eight million, six hundred forty-four thousand, six hundred sixty-three".