5251799650661 has 2 divisors, whose sum is σ = 5251799650662. Its totient is φ = 5251799650660.

The previous prime is 5251799650637. The next prime is 5251799650693. The reversal of 5251799650661 is 1660569971525.

5251799650661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2711900836225 + 2539898814436 = 1646785^2 + 1593706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5251799650661 is a prime.

It is a super-3 number, since 3×5251799650661³ (a number of 39 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5251799650594 and 5251799650603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5251793650661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625899825330 + 2625899825331.

It is an arithmetic number, because the mean of its divisors is an integer number (2625899825331).

Almost surely, 2^{5251799650661} is an apocalyptic number.

It is an amenable number.

5251799650661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5251799650661 is an equidigital number, since it uses as much as digits as its factorization.

5251799650661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618000, while the sum is 62.

The spelling of 5251799650661 in words is "five trillion, two hundred fifty-one billion, seven hundred ninety-nine million, six hundred fifty thousand, six hundred sixty-one".