6648315638 has 4 divisors (see below), whose sum is σ = 9972473460. Its totient is φ = 3324157818.

The previous prime is 6648315571. The next prime is 6648315671. The reversal of 6648315638 is 8365138466.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1662078908 + ... + 1662078911.

It is an arithmetic number, because the mean of its divisors is an integer number (2493118365).

Almost surely, 2^6648315638 is an apocalyptic number.

6648315638 is a deficient number, since it is larger than the sum of its proper divisors (3324157822).

6648315638 is a wasteful number, since it uses less digits than its factorization.

6648315638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324157821.

The product of its digits is 2488320, while the sum is 50.

The square root of 6648315638 is about 81537.2040114205. The cubic root of 6648315638 is about 1880.3435729026.

The spelling of 6648315638 in words is "six billion, six hundred forty-eight million, three hundred fifteen thousand, six hundred thirty-eight".