161043772271 has 2 divisors, whose sum is σ = 161043772272. Its totient is φ = 161043772270.

The previous prime is 161043772249. The next prime is 161043772291. The reversal of 161043772271 is 172277340161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161043772271 - 2¹⁰ = 161043771247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161043772291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80521886135 + 80521886136.

It is an arithmetic number, because the mean of its divisors is an integer number (80521886136).

Almost surely, 2^161043772271 is an apocalyptic number.

161043772271 is a deficient number, since it is larger than the sum of its proper divisors (1).

161043772271 is an equidigital number, since it uses as much as digits as its factorization.

161043772271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 41.

The spelling of 161043772271 in words is "one hundred sixty-one billion, forty-three million, seven hundred seventy-two thousand, two hundred seventy-one".