49778518393 has 2 divisors, whose sum is σ = 49778518394. Its totient is φ = 49778518392.

The previous prime is 49778518289. The next prime is 49778518417. The reversal of 49778518393 is 39381587794.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36148656384 + 13629862009 = 190128^2 + 116747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49778518393 is a prime.

It is a super-3 number, since 3×49778518393³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (49778518793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24889259196 + 24889259197.

It is an arithmetic number, because the mean of its divisors is an integer number (24889259197).

Almost surely, 2^49778518393 is an apocalyptic number.

It is an amenable number.

49778518393 is a deficient number, since it is larger than the sum of its proper divisors (1).

49778518393 is an equidigital number, since it uses as much as digits as its factorization.

49778518393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45722880, while the sum is 64.

The spelling of 49778518393 in words is "forty-nine billion, seven hundred seventy-eight million, five hundred eighteen thousand, three hundred ninety-three".