6543353881 has 9 divisors (see below), whose sum is σ = 6842162271. Its totient is φ = 6257080632.

The previous prime is 6543353867. The next prime is 6543353891. The reversal of 6543353881 is 1883533456.

The square root of 6543353881 is 80891.

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., 6278185225 + 265168656 = 79235^2 + 16284^2 .

It is not a de Polignac number, because 6543353881 - 2⁵ = 6543353849 is a prime.

It is a super-2 number, since 2×6543353881² = 85630960023995524322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6543353801) 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, 1858735 + ... + 1862251.

Almost surely, 2^6543353881 is an apocalyptic number.

6543353881 is the 80891-st square number.

6543353881 is the 40446-th centered octagonal number.

It is an amenable number.

6543353881 is a deficient number, since it is larger than the sum of its proper divisors (298808390).

6543353881 is an frugal number, since it uses more digits than its factorization.

6543353881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7080 (or 3540 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The cubic root of 6543353881 is about 1870.3955887621.

The spelling of 6543353881 in words is "six billion, five hundred forty-three million, three hundred fifty-three thousand, eight hundred eighty-one".