51050050561 has 4 divisors (see below), whose sum is σ = 51392668500. Its totient is φ = 50707432624.

The previous prime is 51050050523. The next prime is 51050050609. The reversal of 51050050561 is 16505005015.

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 7050792961 + 43999257600 = 83969^2 + 209760^2 .

It is a cyclic number.

It is not a de Polignac number, because 51050050561 - 2⁹ = 51050050049 is a prime.

It is a super-2 number, since 2×51050050561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51050050861) 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, 171308746 + ... + 171309043.

It is an arithmetic number, because the mean of its divisors is an integer number (12848167125).

Almost surely, 2^51050050561 is an apocalyptic number.

It is an amenable number.

51050050561 is a deficient number, since it is larger than the sum of its proper divisors (342617939).

51050050561 is a wasteful number, since it uses less digits than its factorization.

51050050561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342617938.

The product of its (nonzero) digits is 3750, while the sum is 28.

Adding to 51050050561 its reverse (16505005015), we get a palindrome (67555055576).

The spelling of 51050050561 in words is "fifty-one billion, fifty million, fifty thousand, five hundred sixty-one".