50720481781 has 2 divisors, whose sum is σ = 50720481782. Its totient is φ = 50720481780.

The previous prime is 50720481769. The next prime is 50720481787. The reversal of 50720481781 is 18718402705.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45085727556 + 5634754225 = 212334^2 + 75065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50720481781 is a prime.

It is a super-2 number, since 2×50720481781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50720481787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25360240890 + 25360240891.

It is an arithmetic number, because the mean of its divisors is an integer number (25360240891).

Almost surely, 2^50720481781 is an apocalyptic number.

It is an amenable number.

50720481781 is a deficient number, since it is larger than the sum of its proper divisors (1).

50720481781 is an equidigital number, since it uses as much as digits as its factorization.

50720481781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125440, while the sum is 43.

The spelling of 50720481781 in words is "fifty billion, seven hundred twenty million, four hundred eighty-one thousand, seven hundred eighty-one".