51340138888697 has 2 divisors, whose sum is σ = 51340138888698. Its totient is φ = 51340138888696.

The previous prime is 51340138888601. The next prime is 51340138888699. The reversal of 51340138888697 is 79688883104315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48893601820816 + 2446537067881 = 6992396^2 + 1564141^2 .

It is a cyclic number.

It is not a de Polignac number, because 51340138888697 - 2¹⁶ = 51340138823161 is a prime.

It is a super-2 number, since 2×51340138888697² (a number of 28 digits) contains 22 as substring.

Together with 51340138888699, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51340138888697.

It is not a weakly prime, because it can be changed into another prime (51340138888699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25670069444348 + 25670069444349.

It is an arithmetic number, because the mean of its divisors is an integer number (25670069444349).

Almost surely, 2^{51340138888697} is an apocalyptic number.

It is an amenable number.

51340138888697 is a deficient number, since it is larger than the sum of its proper divisors (1).

51340138888697 is an equidigital number, since it uses as much as digits as its factorization.

51340138888697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 278691840, while the sum is 71.

The spelling of 51340138888697 in words is "fifty-one trillion, three hundred forty billion, one hundred thirty-eight million, eight hundred eighty-eight thousand, six hundred ninety-seven".