51510616656209 has 2 divisors, whose sum is σ = 51510616656210. Its totient is φ = 51510616656208.

The previous prime is 51510616656151. The next prime is 51510616656217. The reversal of 51510616656209 is 90265661601515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32882139147025 + 18628477509184 = 5734295^2 + 4316072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51510616656209 is a prime.

It is not a weakly prime, because it can be changed into another prime (51510616356209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25755308328104 + 25755308328105.

It is an arithmetic number, because the mean of its divisors is an integer number (25755308328105).

Almost surely, 2^{51510616656209} is an apocalyptic number.

It is an amenable number.

51510616656209 is a deficient number, since it is larger than the sum of its proper divisors (1).

51510616656209 is an equidigital number, since it uses as much as digits as its factorization.

51510616656209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916000, while the sum is 53.

The spelling of 51510616656209 in words is "fifty-one trillion, five hundred ten billion, six hundred sixteen million, six hundred fifty-six thousand, two hundred nine".