51604635517 has 2 divisors, whose sum is σ = 51604635518. Its totient is φ = 51604635516.

The previous prime is 51604635497. The next prime is 51604635559. The reversal of 51604635517 is 71553640615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35783775556 + 15820859961 = 189166^2 + 125781^2 .

It is a cyclic number.

It is not a de Polignac number, because 51604635517 - 2⁷ = 51604635389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51604635587) 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, 25802317758 + 25802317759.

It is an arithmetic number, because the mean of its divisors is an integer number (25802317759).

Almost surely, 2^51604635517 is an apocalyptic number.

It is an amenable number.

51604635517 is a deficient number, since it is larger than the sum of its proper divisors (1).

51604635517 is an equidigital number, since it uses as much as digits as its factorization.

51604635517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 51604635517 in words is "fifty-one billion, six hundred four million, six hundred thirty-five thousand, five hundred seventeen".