850138808191 has 2 divisors, whose sum is σ = 850138808192. Its totient is φ = 850138808190.

The previous prime is 850138808159. The next prime is 850138808291. The reversal of 850138808191 is 191808831058.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 850138808191 - 2⁵ = 850138808159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850138808291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425069404095 + 425069404096.

It is an arithmetic number, because the mean of its divisors is an integer number (425069404096).

Almost surely, 2^850138808191 is an apocalyptic number.

850138808191 is a deficient number, since it is larger than the sum of its proper divisors (1).

850138808191 is an equidigital number, since it uses as much as digits as its factorization.

850138808191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 52.

The spelling of 850138808191 in words is "eight hundred fifty billion, one hundred thirty-eight million, eight hundred eight thousand, one hundred ninety-one".