6605665656 has 32 divisors (see below), whose sum is σ = 17485586640. Its totient is φ = 2072365568.

The previous prime is 6605665631. The next prime is 6605665669. The reversal of 6605665656 is 6565665066.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 6605665599 and 6605665608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8094771 + ... + 8095586.

Almost surely, 2^6605665656 is an apocalyptic number.

It is an amenable number.

6605665656 is an abundant number, since it is smaller than the sum of its proper divisors (10879920984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6605665656 is a wasteful number, since it uses less digits than its factorization.

6605665656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16190383 (or 16190379 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 51.

The square root of 6605665656 is about 81275.2462684673. The cubic root of 6605665656 is about 1876.3140447731.

The spelling of 6605665656 in words is "six billion, six hundred five million, six hundred sixty-five thousand, six hundred fifty-six".