1669144559 has 2 divisors, whose sum is σ = 1669144560. Its totient is φ = 1669144558.

The previous prime is 1669144517. The next prime is 1669144597. The reversal of 1669144559 is 9554419661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1669144559 - 2²⁰ = 1668095983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669141559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834572279 + 834572280.

It is an arithmetic number, because the mean of its divisors is an integer number (834572280).

Almost surely, 2^1669144559 is an apocalyptic number.

1669144559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669144559 is an equidigital number, since it uses as much as digits as its factorization.

1669144559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 50.

The square root of 1669144559 is about 40855.1656342255. The cubic root of 1669144559 is about 1186.2183837916.

The spelling of 1669144559 in words is "one billion, six hundred sixty-nine million, one hundred forty-four thousand, five hundred fifty-nine".