1664415326 has 32 divisors (see below), whose sum is σ = 2933703360. Its totient is φ = 693259776.

The previous prime is 1664415301. The next prime is 1664415341. The reversal of 1664415326 is 6235144661.

It is a self number, because there is not a number n which added to its sum of digits gives 1664415326.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 803420 + ... + 805488.

It is an arithmetic number, because the mean of its divisors is an integer number (91678230).

Almost surely, 2^1664415326 is an apocalyptic number.

1664415326 is a deficient number, since it is larger than the sum of its proper divisors (1269288034).

1664415326 is a wasteful number, since it uses less digits than its factorization.

1664415326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668.

The product of its digits is 103680, while the sum is 38.

The square root of 1664415326 is about 40797.2465492464. The cubic root of 1664415326 is about 1185.0970090367.

Adding to 1664415326 its reverse (6235144661), we get a palindrome (7899559987).

The spelling of 1664415326 in words is "one billion, six hundred sixty-four million, four hundred fifteen thousand, three hundred twenty-six".