49778518417 has 2 divisors, whose sum is σ = 49778518418. Its totient is φ = 49778518416.

The previous prime is 49778518393. The next prime is 49778518457. The reversal of 49778518417 is 71481587794.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44730558016 + 5047960401 = 211496^2 + 71049^2 .

It is a cyclic number.

It is not a de Polignac number, because 49778518417 - 2⁷ = 49778518289 is a prime.

It is not a weakly prime, because it can be changed into another prime (49778518457) 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, 24889259208 + 24889259209.

It is an arithmetic number, because the mean of its divisors is an integer number (24889259209).

Almost surely, 2^49778518417 is an apocalyptic number.

It is an amenable number.

49778518417 is a deficient number, since it is larger than the sum of its proper divisors (1).

49778518417 is an equidigital number, since it uses as much as digits as its factorization.

49778518417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15805440, while the sum is 61.

The spelling of 49778518417 in words is "forty-nine billion, seven hundred seventy-eight million, five hundred eighteen thousand, four hundred seventeen".