2065664191 has 2 divisors, whose sum is σ = 2065664192. Its totient is φ = 2065664190.

The previous prime is 2065664189. The next prime is 2065664219. The reversal of 2065664191 is 1914665602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2065664191 - 2¹ = 2065664189 is a prime.

Together with 2065664189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2065664141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1032832095 + 1032832096.

It is an arithmetic number, because the mean of its divisors is an integer number (1032832096).

Almost surely, 2^2065664191 is an apocalyptic number.

2065664191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2065664191 is an equidigital number, since it uses as much as digits as its factorization.

2065664191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 2065664191 is about 45449.5785569019. The cubic root of 2065664191 is about 1273.5614565668.

The spelling of 2065664191 in words is "two billion, sixty-five million, six hundred sixty-four thousand, one hundred ninety-one".