50565611511561 has 4 divisors (see below), whose sum is σ = 67420815348752. Its totient is φ = 33710407674372.

The previous prime is 50565611511517. The next prime is 50565611511587. The reversal of 50565611511561 is 16511511656505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 50565611511561 - 2¹⁰ = 50565611510537 is a prime.

It is a super-2 number, since 2×50565611511561² (a number of 28 digits) contains 22 as substring.

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 50565611511561.

It is not an unprimeable number, because it can be changed into a prime (50565611511161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8427601918591 + ... + 8427601918596.

It is an arithmetic number, because the mean of its divisors is an integer number (16855203837188).

Almost surely, 2^{50565611511561} is an apocalyptic number.

It is an amenable number.

50565611511561 is a deficient number, since it is larger than the sum of its proper divisors (16855203837191).

50565611511561 is a wasteful number, since it uses less digits than its factorization.

50565611511561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16855203837190.

The product of its (nonzero) digits is 675000, while the sum is 48.

The spelling of 50565611511561 in words is "fifty trillion, five hundred sixty-five billion, six hundred eleven million, five hundred eleven thousand, five hundred sixty-one".