6636699648 has 228 divisors, whose sum is σ = 20038249140. Its totient is φ = 2113929216.

The previous prime is 6636699623. The next prime is 6636699659. The reversal of 6636699648 is 8469966366.

It can be written as a sum of positive squares in 2 ways, for example, as 3229876224 + 3406823424 = 56832^2 + 58368^2 .

It is a super-3 number, since 3×6636699648³ (a number of 30 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68419536 + ... + 68419632.

Almost surely, 2^6636699648 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 6636699648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10019124570).

6636699648 is an abundant number, since it is smaller than the sum of its proper divisors (13401549492).

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

6636699648 is an frugal number, since it uses more digits than its factorization.

6636699648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 131 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 63.

The square root of 6636699648 is about 81465.9416443461. The cubic root of 6636699648 is about 1879.2478173979.

The spelling of 6636699648 in words is "six billion, six hundred thirty-six million, six hundred ninety-nine thousand, six hundred forty-eight".