51281040257 has 16 divisors (see below), whose sum is σ = 54501325200. Its totient is φ = 48158449920.

The previous prime is 51281040247. The next prime is 51281040259. The reversal of 51281040257 is 75204018215.

It can be written as a sum of positive squares in 8 ways, for example, as 12957496561 + 38323543696 = 113831^2 + 195764^2 .

It is a cyclic number.

It is not a de Polignac number, because 51281040257 - 2⁸ = 51281040001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51281040259) 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 15 ways as a sum of consecutive naturals, for example, 4274207 + ... + 4286187.

It is an arithmetic number, because the mean of its divisors is an integer number (3406332825).

Almost surely, 2^51281040257 is an apocalyptic number.

It is an amenable number.

51281040257 is a deficient number, since it is larger than the sum of its proper divisors (3220284943).

51281040257 is a wasteful number, since it uses less digits than its factorization.

51281040257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16036.

The product of its (nonzero) digits is 22400, while the sum is 35.

The spelling of 51281040257 in words is "fifty-one billion, two hundred eighty-one million, forty thousand, two hundred fifty-seven".