51000165561109 has 2 divisors, whose sum is σ = 51000165561110. Its totient is φ = 51000165561108.

The previous prime is 51000165561089. The next prime is 51000165561139. The reversal of 51000165561109 is 90116556100015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35560350562500 + 15439814998609 = 5963250^2 + 3929353^2 .

It is a cyclic number.

It is not a de Polignac number, because 51000165561109 - 2²³ = 51000157172501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51000165561139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25500082780554 + 25500082780555.

It is an arithmetic number, because the mean of its divisors is an integer number (25500082780555).

Almost surely, 2^{51000165561109} is an apocalyptic number.

It is an amenable number.

51000165561109 is a deficient number, since it is larger than the sum of its proper divisors (1).

51000165561109 is an equidigital number, since it uses as much as digits as its factorization.

51000165561109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40500, while the sum is 40.

The spelling of 51000165561109 in words is "fifty-one trillion, one hundred sixty-five million, five hundred sixty-one thousand, one hundred nine".