51343253561 has 2 divisors, whose sum is σ = 51343253562. Its totient is φ = 51343253560.

The previous prime is 51343253543. The next prime is 51343253567. The reversal of 51343253561 is 16535234315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36991213561 + 14352040000 = 192331^2 + 119800^2 .

It is a cyclic number.

It is not a de Polignac number, because 51343253561 - 2⁶ = 51343253497 is a prime.

It is a super-2 number, since 2×51343253561² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51343253567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25671626780 + 25671626781.

It is an arithmetic number, because the mean of its divisors is an integer number (25671626781).

Almost surely, 2^51343253561 is an apocalyptic number.

It is an amenable number.

51343253561 is a deficient number, since it is larger than the sum of its proper divisors (1).

51343253561 is an equidigital number, since it uses as much as digits as its factorization.

51343253561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 38.

Adding to 51343253561 its reverse (16535234315), we get a palindrome (67878487876).

The spelling of 51343253561 in words is "fifty-one billion, three hundred forty-three million, two hundred fifty-three thousand, five hundred sixty-one".