1664543313 has 12 divisors (see below), whose sum is σ = 2407062528. Its totient is φ = 1108439160.

The previous prime is 1664543273. The next prime is 1664543333. The reversal of 1664543313 is 3133454661.

1664543313 is a `hidden beast` number, since 1 + 6 + 645 + 4 + 3 + 3 + 1 + 3 = 666.

It is not a de Polignac number, because 1664543313 - 2⁶ = 1664543249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664543333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96273 + ... + 112238.

It is an arithmetic number, because the mean of its divisors is an integer number (200588544).

Almost surely, 2^1664543313 is an apocalyptic number.

It is an amenable number.

1664543313 is a deficient number, since it is larger than the sum of its proper divisors (742519215).

1664543313 is a wasteful number, since it uses less digits than its factorization.

1664543313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209404 (or 209401 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 1664543313 is about 40798.8150930882. The cubic root of 1664543313 is about 1185.1273846930.

Adding to 1664543313 its reverse (3133454661), we get a palindrome (4797997974).

The spelling of 1664543313 in words is "one billion, six hundred sixty-four million, five hundred forty-three thousand, three hundred thirteen".