6663817836 has 120 divisors (see below), whose sum is σ = 19115190864. Its totient is φ = 2011651200.

The previous prime is 6663817757. The next prime is 6663817843. The reversal of 6663817836 is 6387183666.

It is a super-3 number, since 3×6663817836³ (a number of 30 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 208311 + ... + 238161.

Almost surely, 2^6663817836 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 6663817836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9557595432).

6663817836 is an abundant number, since it is smaller than the sum of its proper divisors (12451373028).

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

6663817836 is a wasteful number, since it uses less digits than its factorization.

6663817836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29933 (or 29922 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 6663817836 is about 81632.2107749141. The cubic root of 6663817836 is about 1881.8039343368.

The spelling of 6663817836 in words is "six billion, six hundred sixty-three million, eight hundred seventeen thousand, eight hundred thirty-six".