51634255243561 has 2 divisors, whose sum is σ = 51634255243562. Its totient is φ = 51634255243560.

The previous prime is 51634255243453. The next prime is 51634255243603. The reversal of 51634255243561 is 16534255243615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50097461137936 + 1536794105625 = 7077956^2 + 1239675^2 .

It is a cyclic number.

It is not a de Polignac number, because 51634255243561 - 2⁷ = 51634255243433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51634255243499 and 51634255243508.

It is not a weakly prime, because it can be changed into another prime (51634255243861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25817127621780 + 25817127621781.

It is an arithmetic number, because the mean of its divisors is an integer number (25817127621781).

Almost surely, 2^{51634255243561} is an apocalyptic number.

It is an amenable number.

51634255243561 is a deficient number, since it is larger than the sum of its proper divisors (1).

51634255243561 is an equidigital number, since it uses as much as digits as its factorization.

51634255243561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960000, while the sum is 52.

The spelling of 51634255243561 in words is "fifty-one trillion, six hundred thirty-four billion, two hundred fifty-five million, two hundred forty-three thousand, five hundred sixty-one".