1645742567171 has 2 divisors, whose sum is σ = 1645742567172. Its totient is φ = 1645742567170.

The previous prime is 1645742567159. The next prime is 1645742567173. The reversal of 1645742567171 is 1717652475461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645742567171 - 2⁶ = 1645742567107 is a prime.

Together with 1645742567173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1645742567173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822871283585 + 822871283586.

It is an arithmetic number, because the mean of its divisors is an integer number (822871283586).

Almost surely, 2^{1645742567171} is an apocalyptic number.

1645742567171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645742567171 is an equidigital number, since it uses as much as digits as its factorization.

1645742567171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9878400, while the sum is 56.

The spelling of 1645742567171 in words is "one trillion, six hundred forty-five billion, seven hundred forty-two million, five hundred sixty-seven thousand, one hundred seventy-one".