5611611561 has 8 divisors (see below), whose sum is σ = 7495254624. Its totient is φ = 3734521440.

The previous prime is 5611611559. The next prime is 5611611569. The reversal of 5611611561 is 1651161165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5611611561 - 2¹ = 5611611559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5611611569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1636236 + ... + 1639661.

It is an arithmetic number, because the mean of its divisors is an integer number (936906828).

Almost surely, 2^5611611561 is an apocalyptic number.

It is an amenable number.

5611611561 is a deficient number, since it is larger than the sum of its proper divisors (1883643063).

5611611561 is a wasteful number, since it uses less digits than its factorization.

5611611561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276471.

The product of its digits is 5400, while the sum is 33.

The square root of 5611611561 is about 74910.6905654994. The cubic root of 5611611561 is about 1777.0345313191.

The spelling of 5611611561 in words is "five billion, six hundred eleven million, six hundred eleven thousand, five hundred sixty-one".