2045665409 has 2 divisors, whose sum is σ = 2045665410. Its totient is φ = 2045665408.

The previous prime is 2045665397. The next prime is 2045665411. The reversal of 2045665409 is 9045665402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1219965184 + 825700225 = 34928^2 + 28735^2 .

It is a cyclic number.

It is not a de Polignac number, because 2045665409 - 2¹⁶ = 2045599873 is a prime.

Together with 2045665411, 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 (2045665469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1022832704 + 1022832705.

It is an arithmetic number, because the mean of its divisors is an integer number (1022832705).

Almost surely, 2^2045665409 is an apocalyptic number.

It is an amenable number.

2045665409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2045665409 is an equidigital number, since it uses as much as digits as its factorization.

2045665409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 2045665409 is about 45229.0328107953. The cubic root of 2045665409 is about 1269.4381148456.

The spelling of 2045665409 in words is "two billion, forty-five million, six hundred sixty-five thousand, four hundred nine".