51312421663 has 2 divisors, whose sum is σ = 51312421664. Its totient is φ = 51312421662.

The previous prime is 51312421637. The next prime is 51312421669. The reversal of 51312421663 is 36612421315.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51312421663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51312421669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25656210831 + 25656210832.

It is an arithmetic number, because the mean of its divisors is an integer number (25656210832).

Almost surely, 2^51312421663 is an apocalyptic number.

51312421663 is a deficient number, since it is larger than the sum of its proper divisors (1).

51312421663 is an equidigital number, since it uses as much as digits as its factorization.

51312421663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

Adding to 51312421663 its reverse (36612421315), we get a palindrome (87924842978).

The spelling of 51312421663 in words is "fifty-one billion, three hundred twelve million, four hundred twenty-one thousand, six hundred sixty-three".