6361561561 has 16 divisors (see below), whose sum is σ = 6461376768. Its totient is φ = 6262848000.

The previous prime is 6361561537. The next prime is 6361561579. The reversal of 6361561561 is 1651651636.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6361561561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6361561501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10584661 + ... + 10585261.

It is an arithmetic number, because the mean of its divisors is an integer number (403836048).

Almost surely, 2^6361561561 is an apocalyptic number.

It is an amenable number.

6361561561 is a deficient number, since it is larger than the sum of its proper divisors (99815207).

6361561561 is a wasteful number, since it uses less digits than its factorization.

6361561561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272.

The product of its digits is 97200, while the sum is 40.

The square root of 6361561561 is about 79759.3979478281. The cubic root of 6361561561 is about 1852.9110789887.

The spelling of 6361561561 in words is "six billion, three hundred sixty-one million, five hundred sixty-one thousand, five hundred sixty-one".