6555655561 has 48 divisors (see below), whose sum is σ = 8342611200. Its totient is φ = 5105503872.

The previous prime is 6555655559. The next prime is 6555655577. The reversal of 6555655561 is 1655565556.

It is not a de Polignac number, because 6555655561 - 2¹ = 6555655559 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (6555655501) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 18260700 + ... + 18261058.

It is an arithmetic number, because the mean of its divisors is an integer number (173804400).

Almost surely, 2^6555655561 is an apocalyptic number.

It is an amenable number.

6555655561 is a deficient number, since it is larger than the sum of its proper divisors (1786955639).

6555655561 is a wasteful number, since it uses less digits than its factorization.

6555655561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758 (or 751 counting only the distinct ones).

The product of its digits is 3375000, while the sum is 49.

The square root of 6555655561 is about 80967.0029147677. The cubic root of 6555655561 is about 1871.5669861975.

The spelling of 6555655561 in words is "six billion, five hundred fifty-five million, six hundred fifty-five thousand, five hundred sixty-one".