50643073721 has 2 divisors, whose sum is σ = 50643073722. Its totient is φ = 50643073720.

The previous prime is 50643073711. The next prime is 50643073739. The reversal of 50643073721 is 12737034605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44152515625 + 6490558096 = 210125^2 + 80564^2 .

It is a cyclic number.

It is not a de Polignac number, because 50643073721 - 2³⁰ = 49569331897 is a prime.

It is not a weakly prime, because it can be changed into another prime (50643073711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25321536860 + 25321536861.

It is an arithmetic number, because the mean of its divisors is an integer number (25321536861).

Almost surely, 2^50643073721 is an apocalyptic number.

It is an amenable number.

50643073721 is a deficient number, since it is larger than the sum of its proper divisors (1).

50643073721 is an equidigital number, since it uses as much as digits as its factorization.

50643073721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 38.

The spelling of 50643073721 in words is "fifty billion, six hundred forty-three million, seventy-three thousand, seven hundred twenty-one".