50506506661 has 6 divisors (see below), whose sum is σ = 54690477810. Its totient is φ = 46621390608.

The previous prime is 50506506653. The next prime is 50506506709. The reversal of 50506506661 is 16660560505.

It can be written as a sum of positive squares in 3 ways, for example, as 6282940225 + 44223566436 = 79265^2 + 210294^2 .

It is not a de Polignac number, because 50506506661 - 2³ = 50506506653 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 (50506506601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 149427366 + ... + 149427703.

It is an arithmetic number, because the mean of its divisors is an integer number (9115079635).

Almost surely, 2^50506506661 is an apocalyptic number.

It is an amenable number.

50506506661 is a deficient number, since it is larger than the sum of its proper divisors (4183971149).

50506506661 is a wasteful number, since it uses less digits than its factorization.

50506506661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298855095 (or 298855082 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 50506506661 in words is "fifty billion, five hundred six million, five hundred six thousand, six hundred sixty-one".