6655115565 has 72 divisors (see below), whose sum is σ = 13465991448. Its totient is φ = 3031660800.

The previous prime is 6655115539. The next prime is 6655115581. The reversal of 6655115565 is 5655115566.

It can be written as a sum of positive squares in 4 ways, for example, as 4027425444 + 2627690121 = 63462^2 + 51261^2 .

It is not a de Polignac number, because 6655115565 - 2⁹ = 6655115053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6655115565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 640915 + ... + 651215.

It is an arithmetic number, because the mean of its divisors is an integer number (187027659).

Almost surely, 2^6655115565 is an apocalyptic number.

It is an amenable number.

6655115565 is an abundant number, since it is smaller than the sum of its proper divisors (6810875883).

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

6655115565 is a wasteful number, since it uses less digits than its factorization.

6655115565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10619 (or 10609 counting only the distinct ones).

The product of its digits is 675000, while the sum is 45.

The square root of 6655115565 is about 81578.8916632238. The cubic root of 6655115565 is about 1880.9844290703.

Subtracting from 6655115565 its reverse (5655115566), we obtain a palindrome (999999999).

The spelling of 6655115565 in words is "six billion, six hundred fifty-five million, one hundred fifteen thousand, five hundred sixty-five".