6623666553 has 24 divisors (see below), whose sum is σ = 10429328064. Its totient is φ = 3662845920.

The previous prime is 6623666549. The next prime is 6623666561. The reversal of 6623666553 is 3556663266.

It is not a de Polignac number, because 6623666553 - 2² = 6623666549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6623666593) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143926 + ... + 184287.

It is an arithmetic number, because the mean of its divisors is an integer number (434555336).

Almost surely, 2^6623666553 is an apocalyptic number.

It is an amenable number.

6623666553 is a deficient number, since it is larger than the sum of its proper divisors (3805661511).

6623666553 is a wasteful number, since it uses less digits than its factorization.

6623666553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328285 (or 328254 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 48.

The square root of 6623666553 is about 81385.9112684745. The cubic root of 6623666553 is about 1878.0168609078.

The spelling of 6623666553 in words is "six billion, six hundred twenty-three million, six hundred sixty-six thousand, five hundred fifty-three".