819049916173 has 2 divisors, whose sum is σ = 819049916174. Its totient is φ = 819049916172.

The previous prime is 819049916149. The next prime is 819049916189. The reversal of 819049916173 is 371619940918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413837463204 + 405212452969 = 643302^2 + 636563^2 .

It is a cyclic number.

It is not a de Polignac number, because 819049916173 - 2⁵ = 819049916141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819049916273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409524958086 + 409524958087.

It is an arithmetic number, because the mean of its divisors is an integer number (409524958087).

Almost surely, 2^819049916173 is an apocalyptic number.

It is an amenable number.

819049916173 is a deficient number, since it is larger than the sum of its proper divisors (1).

819049916173 is an equidigital number, since it uses as much as digits as its factorization.

819049916173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 58.

The spelling of 819049916173 in words is "eight hundred nineteen billion, forty-nine million, nine hundred sixteen thousand, one hundred seventy-three".