51210544362161 has 2 divisors, whose sum is σ = 51210544362162. Its totient is φ = 51210544362160.

The previous prime is 51210544362083. The next prime is 51210544362179. The reversal of 51210544362161 is 16126344501215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45362582280625 + 5847962081536 = 6735175^2 + 2418256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51210544362161 is a prime.

It is not a weakly prime, because it can be changed into another prime (51210544362181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25605272181080 + 25605272181081.

It is an arithmetic number, because the mean of its divisors is an integer number (25605272181081).

Almost surely, 2^{51210544362161} is an apocalyptic number.

It is an amenable number.

51210544362161 is a deficient number, since it is larger than the sum of its proper divisors (1).

51210544362161 is an equidigital number, since it uses as much as digits as its factorization.

51210544362161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 41.

Adding to 51210544362161 its reverse (16126344501215), we get a palindrome (67336888863376).

The spelling of 51210544362161 in words is "fifty-one trillion, two hundred ten billion, five hundred forty-four million, three hundred sixty-two thousand, one hundred sixty-one".