6628806655 has 16 divisors (see below), whose sum is σ = 8405498880. Its totient is φ = 5008262688.

The previous prime is 6628806629. The next prime is 6628806673. The reversal of 6628806655 is 5566088266.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6628806655 - 2⁵ = 6628806623 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355737 + ... + 373906.

It is an arithmetic number, because the mean of its divisors is an integer number (525343680).

Almost surely, 2^6628806655 is an apocalyptic number.

6628806655 is a deficient number, since it is larger than the sum of its proper divisors (1776692225).

6628806655 is a wasteful number, since it uses less digits than its factorization.

6628806655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729750.

The product of its (nonzero) digits is 4147200, while the sum is 52.

The square root of 6628806655 is about 81417.4837181794. The cubic root of 6628806655 is about 1878.5025285862.

The spelling of 6628806655 in words is "six billion, six hundred twenty-eight million, eight hundred six thousand, six hundred fifty-five".