51717245557 has 2 divisors, whose sum is σ = 51717245558. Its totient is φ = 51717245556.

The previous prime is 51717245537. The next prime is 51717245597. The reversal of 51717245557 is 75554271715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46554966756 + 5162278801 = 215766^2 + 71849^2 .

It is a cyclic number.

It is not a de Polignac number, because 51717245557 - 2⁷ = 51717245429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51717245557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51717245537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25858622778 + 25858622779.

It is an arithmetic number, because the mean of its divisors is an integer number (25858622779).

Almost surely, 2^51717245557 is an apocalyptic number.

It is an amenable number.

51717245557 is a deficient number, since it is larger than the sum of its proper divisors (1).

51717245557 is an equidigital number, since it uses as much as digits as its factorization.

51717245557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1715000, while the sum is 49.

The spelling of 51717245557 in words is "fifty-one billion, seven hundred seventeen million, two hundred forty-five thousand, five hundred fifty-seven".