6638795968 has 168 divisors, whose sum is σ = 15715000320. Its totient is φ = 2773854720.

The previous prime is 6638795963. The next prime is 6638796007. The reversal of 6638795968 is 8695978366.

It is a super-2 number, since 2×6638795968² = 88147223809466114048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6638795963) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31463383 + ... + 31463593.

Almost surely, 2^6638795968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6638795968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7857500160).

6638795968 is an abundant number, since it is smaller than the sum of its proper divisors (9076204352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6638795968 is a wasteful number, since it uses less digits than its factorization.

6638795968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 426 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 67.

The square root of 6638795968 is about 81478.8068641165. The cubic root of 6638795968 is about 1879.4456612199.

The spelling of 6638795968 in words is "six billion, six hundred thirty-eight million, seven hundred ninety-five thousand, nine hundred sixty-eight".