51857088769 has 2 divisors, whose sum is σ = 51857088770. Its totient is φ = 51857088768.

The previous prime is 51857088739. The next prime is 51857088781. The reversal of 51857088769 is 96788075815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41959425600 + 9897663169 = 204840^2 + 99487^2 .

It is a cyclic number.

It is not a de Polignac number, because 51857088769 - 2⁵ = 51857088737 is a prime.

It is a super-2 number, since 2×51857088769² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51857088769.

It is not a weakly prime, because it can be changed into another prime (51857088739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25928544384 + 25928544385.

It is an arithmetic number, because the mean of its divisors is an integer number (25928544385).

Almost surely, 2^51857088769 is an apocalyptic number.

It is an amenable number.

51857088769 is a deficient number, since it is larger than the sum of its proper divisors (1).

51857088769 is an equidigital number, since it uses as much as digits as its factorization.

51857088769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33868800, while the sum is 64.

The spelling of 51857088769 in words is "fifty-one billion, eight hundred fifty-seven million, eighty-eight thousand, seven hundred sixty-nine".