51338664617 has 2 divisors, whose sum is σ = 51338664618. Its totient is φ = 51338664616.

The previous prime is 51338664583. The next prime is 51338664631. The reversal of 51338664617 is 71646683315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29005155481 + 22333509136 = 170309^2 + 149444^2 .

It is a cyclic number.

It is not a de Polignac number, because 51338664617 - 2¹² = 51338660521 is a prime.

It is not a weakly prime, because it can be changed into another prime (51338663617) 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, 25669332308 + 25669332309.

It is an arithmetic number, because the mean of its divisors is an integer number (25669332309).

Almost surely, 2^51338664617 is an apocalyptic number.

It is an amenable number.

51338664617 is a deficient number, since it is larger than the sum of its proper divisors (1).

51338664617 is an equidigital number, since it uses as much as digits as its factorization.

51338664617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 50.

The spelling of 51338664617 in words is "fifty-one billion, three hundred thirty-eight million, six hundred sixty-four thousand, six hundred seventeen".