6643564231 has 8 divisors (see below), whose sum is σ = 6656590080. Its totient is φ = 6630553272.

The previous prime is 6643564223. The next prime is 6643564243. The reversal of 6643564231 is 1324653466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6643564231 - 2³ = 6643564223 is a prime.

It is a super-2 number, since 2×6643564231² = 88273891382845242722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643564531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1280200 + ... + 1285378.

It is an arithmetic number, because the mean of its divisors is an integer number (832073760).

Almost surely, 2^6643564231 is an apocalyptic number.

6643564231 is a deficient number, since it is larger than the sum of its proper divisors (13025849).

6643564231 is a wasteful number, since it uses less digits than its factorization.

6643564231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7445.

The product of its digits is 311040, while the sum is 40.

The square root of 6643564231 is about 81508.0623680872. The cubic root of 6643564231 is about 1879.8955192238.

The spelling of 6643564231 in words is "six billion, six hundred forty-three million, five hundred sixty-four thousand, two hundred thirty-one".