51340138888601 has 2 divisors, whose sum is σ = 51340138888602. Its totient is φ = 51340138888600.

The previous prime is 51340138888559. The next prime is 51340138888697. The reversal of 51340138888601 is 10688883104315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51194597401600 + 145541487001 = 7155040^2 + 381499^2 .

It is a cyclic number.

It is not a de Polignac number, because 51340138888601 - 2²² = 51340134694297 is a prime.

It is a super-2 number, since 2×51340138888601² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51340138888201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25670069444300 + 25670069444301.

It is an arithmetic number, because the mean of its divisors is an integer number (25670069444301).

Almost surely, 2^{51340138888601} is an apocalyptic number.

It is an amenable number.

51340138888601 is a deficient number, since it is larger than the sum of its proper divisors (1).

51340138888601 is an equidigital number, since it uses as much as digits as its factorization.

51340138888601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4423680, while the sum is 56.

The spelling of 51340138888601 in words is "fifty-one trillion, three hundred forty billion, one hundred thirty-eight million, eight hundred eighty-eight thousand, six hundred one".