51544623051209 has 2 divisors, whose sum is σ = 51544623051210. Its totient is φ = 51544623051208.

The previous prime is 51544623051203. The next prime is 51544623051253. The reversal of 51544623051209 is 90215032644515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27838581907984 + 23706041143225 = 5276228^2 + 4868885^2 .

It is a cyclic number.

It is not a de Polignac number, because 51544623051209 - 2⁴⁴ = 33952437006793 is a prime.

It is not a weakly prime, because it can be changed into another prime (51544623051203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25772311525604 + 25772311525605.

It is an arithmetic number, because the mean of its divisors is an integer number (25772311525605).

Almost surely, 2^{51544623051209} is an apocalyptic number.

It is an amenable number.

51544623051209 is a deficient number, since it is larger than the sum of its proper divisors (1).

51544623051209 is an equidigital number, since it uses as much as digits as its factorization.

51544623051209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 51544623051209 in words is "fifty-one trillion, five hundred forty-four billion, six hundred twenty-three million, fifty-one thousand, two hundred nine".