50778521257 has 2 divisors, whose sum is σ = 50778521258. Its totient is φ = 50778521256.

The previous prime is 50778521221. The next prime is 50778521293. The reversal of 50778521257 is 75212587705.

It is a balanced prime because it is at equal distance from previous prime (50778521221) and next prime (50778521293).

It can be written as a sum of positive squares in only one way, i.e., 37612335721 + 13166185536 = 193939^2 + 114744^2 .

It is a cyclic number.

It is not a de Polignac number, because 50778521257 - 2²⁷ = 50644303529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 50778521257.

It is not a weakly prime, because it can be changed into another prime (50778521957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25389260628 + 25389260629.

It is an arithmetic number, because the mean of its divisors is an integer number (25389260629).

Almost surely, 2^50778521257 is an apocalyptic number.

It is an amenable number.

50778521257 is a deficient number, since it is larger than the sum of its proper divisors (1).

50778521257 is an equidigital number, since it uses as much as digits as its factorization.

50778521257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1372000, while the sum is 49.

The spelling of 50778521257 in words is "fifty billion, seven hundred seventy-eight million, five hundred twenty-one thousand, two hundred fifty-seven".