51263605717 has 2 divisors, whose sum is σ = 51263605718. Its totient is φ = 51263605716.

The previous prime is 51263605699. The next prime is 51263605817. The reversal of 51263605717 is 71750636215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46601583876 + 4662021841 = 215874^2 + 68279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51263605717 is a prime.

It is a super-2 number, since 2×51263605717² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51263605817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25631802858 + 25631802859.

It is an arithmetic number, because the mean of its divisors is an integer number (25631802859).

Almost surely, 2^51263605717 is an apocalyptic number.

It is an amenable number.

51263605717 is a deficient number, since it is larger than the sum of its proper divisors (1).

51263605717 is an equidigital number, since it uses as much as digits as its factorization.

51263605717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 264600, while the sum is 43.

The spelling of 51263605717 in words is "fifty-one billion, two hundred sixty-three million, six hundred five thousand, seven hundred seventeen".