1664535325 has 6 divisors (see below), whose sum is σ = 2064023834. Its totient is φ = 1331628240.

The previous prime is 1664535307. The next prime is 1664535329. The reversal of 1664535325 is 5235354661.

It can be written as a sum of positive squares in 3 ways, for example, as 161112249 + 1503423076 = 12693^2 + 38774^2 .

It is not a de Polignac number, because 1664535325 - 2¹⁷ = 1664404253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664535329) 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 5 ways as a sum of consecutive naturals, for example, 33290682 + ... + 33290731.

Almost surely, 2^1664535325 is an apocalyptic number.

It is an amenable number.

1664535325 is a deficient number, since it is larger than the sum of its proper divisors (399488509).

1664535325 is an equidigital number, since it uses as much as digits as its factorization.

1664535325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66581423 (or 66581418 counting only the distinct ones).

The product of its digits is 324000, while the sum is 40.

The square root of 1664535325 is about 40798.7171979708. The cubic root of 1664535325 is about 1185.1254889152.

Adding to 1664535325 its reverse (5235354661), we get a palindrome (6899889986).

The spelling of 1664535325 in words is "one billion, six hundred sixty-four million, five hundred thirty-five thousand, three hundred twenty-five".