51086818375049 has 16 divisors (see below), whose sum is σ = 51268007590800. Its totient is φ = 50905901758464.

The previous prime is 51086818374971. The next prime is 51086818375067. The reversal of 51086818375049 is 94057381868015.

It can be written as a sum of positive squares in 8 ways, for example, as 3663376860025 + 47423441515024 = 1913995^2 + 6886468^2 .

It is a cyclic number.

It is not a de Polignac number, because 51086818375049 - 2⁴⁴ = 33494632330633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51086818375249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4202249279 + ... + 4202261435.

It is an arithmetic number, because the mean of its divisors is an integer number (3204250474425).

Almost surely, 2^{51086818375049} is an apocalyptic number.

It is an amenable number.

51086818375049 is a deficient number, since it is larger than the sum of its proper divisors (181189215751).

51086818375049 is a wasteful number, since it uses less digits than its factorization.

51086818375049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22172.

The product of its (nonzero) digits is 58060800, while the sum is 65.

The spelling of 51086818375049 in words is "fifty-one trillion, eighty-six billion, eight hundred eighteen million, three hundred seventy-five thousand, forty-nine".