50255611661 has 4 divisors (see below), whose sum is σ = 50262394812. Its totient is φ = 50248828512.

The previous prime is 50255611643. The next prime is 50255611663. The reversal of 50255611661 is 16611655205.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16611655205 = 5 ⋅3322331041.

It can be written as a sum of positive squares in 2 ways, for example, as 47167586761 + 3088024900 = 217181^2 + 55570^2 .

It is a cyclic number.

It is not a de Polignac number, because 50255611661 - 2¹⁰ = 50255610637 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 (50255611663) 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, 3380450 + ... + 3395283.

It is an arithmetic number, because the mean of its divisors is an integer number (12565598703).

Almost surely, 2^50255611661 is an apocalyptic number.

It is an amenable number.

50255611661 is a deficient number, since it is larger than the sum of its proper divisors (6783151).

50255611661 is an equidigital number, since it uses as much as digits as its factorization.

50255611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783150.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 50255611661 in words is "fifty billion, two hundred fifty-five million, six hundred eleven thousand, six hundred sixty-one".