6611065561 has 12 divisors (see below), whose sum is σ = 7028311572. Its totient is φ = 6217352064.

The previous prime is 6611065547. The next prime is 6611065577. The reversal of 6611065561 is 1655601166.

6611065561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2440360000 + 4170705561 = 49400^2 + 64581^2 .

It is not a de Polignac number, because 6611065561 - 2²¹ = 6608968409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6611065561.

It is not an unprimeable number, because it can be changed into a prime (6611065511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17380 + ... + 116293.

It is an arithmetic number, because the mean of its divisors is an integer number (585692631).

Almost surely, 2^6611065561 is an apocalyptic number.

It is an amenable number.

6611065561 is a deficient number, since it is larger than the sum of its proper divisors (417246011).

6611065561 is a wasteful number, since it uses less digits than its factorization.

6611065561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133848 (or 133829 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 6611065561 is about 81308.4593446463. The cubic root of 6611065561 is about 1876.8251796353.

The spelling of 6611065561 in words is "six billion, six hundred eleven million, sixty-five thousand, five hundred sixty-one".