1664806089 has 12 divisors (see below), whose sum is σ = 2225589296. Its totient is φ = 1106951808.

The previous prime is 1664806067. The next prime is 1664806093. The reversal of 1664806089 is 9806084661.

It is not a de Polignac number, because 1664806089 - 2⁵ = 1664806057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664806489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1791577 + ... + 1792505.

Almost surely, 2^1664806089 is an apocalyptic number.

It is an amenable number.

1664806089 is a deficient number, since it is larger than the sum of its proper divisors (560783207).

1664806089 is an frugal number, since it uses more digits than its factorization.

1664806089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504 (or 1575 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 1664806089 is about 40802.0353536438. The cubic root of 1664806089 is about 1185.1897454708.

The spelling of 1664806089 in words is "one billion, six hundred sixty-four million, eight hundred six thousand, eighty-nine".