51561015089 has 2 divisors, whose sum is σ = 51561015090. Its totient is φ = 51561015088.

The previous prime is 51561015013. The next prime is 51561015109. The reversal of 51561015089 is 98051016515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51072384064 + 488631025 = 225992^2 + 22105^2 .

It is a cyclic number.

It is not a de Polignac number, because 51561015089 - 2¹² = 51561010993 is a prime.

It is not a weakly prime, because it can be changed into another prime (51561035089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25780507544 + 25780507545.

It is an arithmetic number, because the mean of its divisors is an integer number (25780507545).

Almost surely, 2^51561015089 is an apocalyptic number.

It is an amenable number.

51561015089 is a deficient number, since it is larger than the sum of its proper divisors (1).

51561015089 is an equidigital number, since it uses as much as digits as its factorization.

51561015089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 41.

The spelling of 51561015089 in words is "fifty-one billion, five hundred sixty-one million, fifteen thousand, eighty-nine".