50561335661 has 4 divisors (see below), whose sum is σ = 50567953500. Its totient is φ = 50554717824.

The previous prime is 50561335589. The next prime is 50561335673. The reversal of 50561335661 is 16653316505.

It is a happy number.

50561335661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1800304900 + 48761030761 = 42430^2 + 220819^2 .

It is a cyclic number.

It is not a de Polignac number, because 50561335661 - 2³⁴ = 33381466477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50561335361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3297446 + ... + 3312743.

It is an arithmetic number, because the mean of its divisors is an integer number (12641988375).

Almost surely, 2^50561335661 is an apocalyptic number.

It is an amenable number.

50561335661 is a deficient number, since it is larger than the sum of its proper divisors (6617839).

50561335661 is an equidigital number, since it uses as much as digits as its factorization.

50561335661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6617838.

The product of its (nonzero) digits is 243000, while the sum is 41.

The spelling of 50561335661 in words is "fifty billion, five hundred sixty-one million, three hundred thirty-five thousand, six hundred sixty-one".