50681855891 has 2 divisors, whose sum is σ = 50681855892. Its totient is φ = 50681855890.

The previous prime is 50681855869. The next prime is 50681855963. The reversal of 50681855891 is 19855818605.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50681855891 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (50681855821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25340927945 + 25340927946.

It is an arithmetic number, because the mean of its divisors is an integer number (25340927946).

Almost surely, 2^50681855891 is an apocalyptic number.

50681855891 is a deficient number, since it is larger than the sum of its proper divisors (1).

50681855891 is an equidigital number, since it uses as much as digits as its factorization.

50681855891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456000, while the sum is 56.

The spelling of 50681855891 in words is "fifty billion, six hundred eighty-one million, eight hundred fifty-five thousand, eight hundred ninety-one".