50778138318253 has 2 divisors, whose sum is σ = 50778138318254. Its totient is φ = 50778138318252.

The previous prime is 50778138318251. The next prime is 50778138318269. The reversal of 50778138318253 is 35281383187705.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50563433975209 + 214704343044 = 7110797^2 + 463362^2 .

It is a cyclic number.

It is not a de Polignac number, because 50778138318253 - 2¹ = 50778138318251 is a prime.

It is a super-2 number, since 2×50778138318253² (a number of 28 digits) contains 22 as substring.

Together with 50778138318251, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 50778138318191 and 50778138318200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50778138318251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25389069159126 + 25389069159127.

It is an arithmetic number, because the mean of its divisors is an integer number (25389069159127).

Almost surely, 2^{50778138318253} is an apocalyptic number.

It is an amenable number.

50778138318253 is a deficient number, since it is larger than the sum of its proper divisors (1).

50778138318253 is an equidigital number, since it uses as much as digits as its factorization.

50778138318253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33868800, while the sum is 61.

The spelling of 50778138318253 in words is "fifty trillion, seven hundred seventy-eight billion, one hundred thirty-eight million, three hundred eighteen thousand, two hundred fifty-three".