5565061561 has 4 divisors (see below), whose sum is σ = 5568800500. Its totient is φ = 5561322624.

The previous prime is 5565061549. The next prime is 5565061583. The reversal of 5565061561 is 1651605655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3086913600 + 2478147961 = 55560^2 + 49781^2 .

It is a cyclic number.

It is not a de Polignac number, because 5565061561 - 2⁷ = 5565061433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5565061501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1867236 + ... + 1870213.

It is an arithmetic number, because the mean of its divisors is an integer number (1392200125).

Almost surely, 2^5565061561 is an apocalyptic number.

It is an amenable number.

5565061561 is a deficient number, since it is larger than the sum of its proper divisors (3738939).

5565061561 is a wasteful number, since it uses less digits than its factorization.

5565061561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3738938.

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 5565061561 is about 74599.3402182620. The cubic root of 5565061561 is about 1772.1072035085.

The spelling of 5565061561 in words is "five billion, five hundred sixty-five million, sixty-one thousand, five hundred sixty-one".