51845161321 has 2 divisors, whose sum is σ = 51845161322. Its totient is φ = 51845161320.

The previous prime is 51845161253. The next prime is 51845161331. The reversal of 51845161321 is 12316154815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40386529296 + 11458632025 = 200964^2 + 107045^2 .

It is a cyclic number.

It is not a de Polignac number, because 51845161321 - 2¹⁵ = 51845128553 is a prime.

It is a super-3 number, since 3×51845161321³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (51845161331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25922580660 + 25922580661.

It is an arithmetic number, because the mean of its divisors is an integer number (25922580661).

Almost surely, 2^51845161321 is an apocalyptic number.

It is an amenable number.

51845161321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51845161321 is an equidigital number, since it uses as much as digits as its factorization.

51845161321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 37.

It can be divided in two parts, 5184 and 5161321, that added together give a triangular number (5166505 = T₃₂₁₄).

The spelling of 51845161321 in words is "fifty-one billion, eight hundred forty-five million, one hundred sixty-one thousand, three hundred twenty-one".