2165317642771 has 2 divisors, whose sum is σ = 2165317642772. Its totient is φ = 2165317642770.

The previous prime is 2165317642769. The next prime is 2165317642823. The reversal of 2165317642771 is 1772467135612.

It is a happy number.

It is an a-pointer prime, because the next prime (2165317642823) can be obtained adding 2165317642771 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2165317642771 - 2¹ = 2165317642769 is a prime.

Together with 2165317642769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2165317642171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082658821385 + 1082658821386.

It is an arithmetic number, because the mean of its divisors is an integer number (1082658821386).

Almost surely, 2^{2165317642771} is an apocalyptic number.

2165317642771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165317642771 is an equidigital number, since it uses as much as digits as its factorization.

2165317642771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2963520, while the sum is 52.

The spelling of 2165317642771 in words is "two trillion, one hundred sixty-five billion, three hundred seventeen million, six hundred forty-two thousand, seven hundred seventy-one".