51711127681 has 6 divisors (see below), whose sum is σ = 54576010482. Its totient is φ = 48989489040.

The previous prime is 51711127667. The next prime is 51711127693. The reversal of 51711127681 is 18672111715.

It can be written as a sum of positive squares in only one way, i.e., 33966490000 + 17744637681 = 184300^2 + 133209^2 .

It is not a de Polignac number, because 51711127681 - 2⁷ = 51711127553 is a prime.

It is a super-2 number, since 2×51711127681² (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 (51711127661) 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, 71621700 + ... + 71622421.

It is an arithmetic number, because the mean of its divisors is an integer number (9096001747).

Almost surely, 2^51711127681 is an apocalyptic number.

It is an amenable number.

51711127681 is a deficient number, since it is larger than the sum of its proper divisors (2864882801).

51711127681 is a wasteful number, since it uses less digits than its factorization.

51711127681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143244159 (or 143244140 counting only the distinct ones).

The product of its digits is 23520, while the sum is 40.

The spelling of 51711127681 in words is "fifty-one billion, seven hundred eleven million, one hundred twenty-seven thousand, six hundred eighty-one".