6655561656 has 16 divisors (see below), whose sum is σ = 16638904200. Its totient is φ = 2218520544.

The previous prime is 6655561643. The next prime is 6655561663. The reversal of 6655561656 is 6561655566.

It is a junction number, because it is equal to n+sod(n) for n = 6655561599 and 6655561608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138657511 + ... + 138657558.

Almost surely, 2^6655561656 is an apocalyptic number.

It is an amenable number.

6655561656 is an abundant number, since it is smaller than the sum of its proper divisors (9983342544).

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

6655561656 is a wasteful number, since it uses less digits than its factorization.

6655561656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277315078 (or 277315074 counting only the distinct ones).

The product of its digits is 4860000, while the sum is 51.

The square root of 6655561656 is about 81581.6257254046. The cubic root of 6655561656 is about 1881.0264554619.

The spelling of 6655561656 in words is "six billion, six hundred fifty-five million, five hundred sixty-one thousand, six hundred fifty-six".