6636872089 has 9 divisors (see below), whose sum is σ = 6806120511. Its totient is φ = 6471738480.

The previous prime is 6636872071. The next prime is 6636872093. The reversal of 6636872089 is 9802786366.

It is a happy number.

The square root of 6636872089 is 81467.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 319801689 + 6317070400 = 17883^2 + 79480^2 .

It is not a de Polignac number, because 6636872089 - 2¹³ = 6636863897 is a prime.

It is a super-2 number, since 2×6636872089² = 88096142251494447842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6636876089) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3339154 + ... + 3341140.

Almost surely, 2^6636872089 is an apocalyptic number.

6636872089 is the 81467-th square number.

6636872089 is the 40734-th centered octagonal number.

It is an amenable number.

6636872089 is a deficient number, since it is larger than the sum of its proper divisors (169248422).

6636872089 is an frugal number, since it uses more digits than its factorization.

6636872089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056 (or 2028 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 55.

The cubic root of 6636872089 is about 1879.2640933877.

The spelling of 6636872089 in words is "six billion, six hundred thirty-six million, eight hundred seventy-two thousand, eighty-nine".