6643514553 has 24 divisors (see below), whose sum is σ = 9617144832. Its totient is φ = 4077523008.

The previous prime is 6643514497. The next prime is 6643514587. The reversal of 6643514553 is 3554153466.

It is not a de Polignac number, because 6643514553 - 2⁹ = 6643514041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6643514753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177075 + ... + 211287.

It is an arithmetic number, because the mean of its divisors is an integer number (400714368).

Almost surely, 2^6643514553 is an apocalyptic number.

It is an amenable number.

6643514553 is a deficient number, since it is larger than the sum of its proper divisors (2973630279).

6643514553 is a wasteful number, since it uses less digits than its factorization.

6643514553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34625 (or 34612 counting only the distinct ones).

The product of its digits is 648000, while the sum is 42.

The square root of 6643514553 is about 81507.7576246580. The cubic root of 6643514553 is about 1879.8908335019.

The spelling of 6643514553 in words is "six billion, six hundred forty-three million, five hundred fourteen thousand, five hundred fifty-three".