50778605728309 has 2 divisors, whose sum is σ = 50778605728310. Its totient is φ = 50778605728308.

The previous prime is 50778605728261. The next prime is 50778605728451. The reversal of 50778605728309 is 90382750687705.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46529833553284 + 4248772175025 = 6821278^2 + 2061255^2 .

It is a cyclic number.

It is not a de Polignac number, because 50778605728309 - 2²⁵ = 50778572173877 is a prime.

It is a super-2 number, since 2×50778605728309² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50778605528309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25389302864154 + 25389302864155.

It is an arithmetic number, because the mean of its divisors is an integer number (25389302864155).

Almost surely, 2^{50778605728309} is an apocalyptic number.

It is an amenable number.

50778605728309 is a deficient number, since it is larger than the sum of its proper divisors (1).

50778605728309 is an equidigital number, since it uses as much as digits as its factorization.

50778605728309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 177811200, while the sum is 67.

The spelling of 50778605728309 in words is "fifty trillion, seven hundred seventy-eight billion, six hundred five million, seven hundred twenty-eight thousand, three hundred nine".