2161766724191 has 2 divisors, whose sum is σ = 2161766724192. Its totient is φ = 2161766724190.

The previous prime is 2161766724163. The next prime is 2161766724193. The reversal of 2161766724191 is 1914276671612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2161766724191 - 2³⁴ = 2144586855007 is a prime.

Together with 2161766724193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161766724193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080883362095 + 1080883362096.

It is an arithmetic number, because the mean of its divisors is an integer number (1080883362096).

Almost surely, 2^{2161766724191} is an apocalyptic number.

2161766724191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161766724191 is an equidigital number, since it uses as much as digits as its factorization.

2161766724191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The spelling of 2161766724191 in words is "two trillion, one hundred sixty-one billion, seven hundred sixty-six million, seven hundred twenty-four thousand, one hundred ninety-one".