51757787369 has 2 divisors, whose sum is σ = 51757787370. Its totient is φ = 51757787368.

The previous prime is 51757787357. The next prime is 51757787371. The reversal of 51757787369 is 96378775715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45105264400 + 6652522969 = 212380^2 + 81563^2 .

It is a cyclic number.

It is not a de Polignac number, because 51757787369 - 2⁴ = 51757787353 is a prime.

It is a super-2 number, since 2×51757787369² (a number of 22 digits) contains 22 as substring.

Together with 51757787371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51757787399) 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, 25878893684 + 25878893685.

It is an arithmetic number, because the mean of its divisors is an integer number (25878893685).

Almost surely, 2^51757787369 is an apocalyptic number.

It is an amenable number.

51757787369 is a deficient number, since it is larger than the sum of its proper divisors (1).

51757787369 is an equidigital number, since it uses as much as digits as its factorization.

51757787369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77792400, while the sum is 65.

The spelling of 51757787369 in words is "fifty-one billion, seven hundred fifty-seven million, seven hundred eighty-seven thousand, three hundred sixty-nine".