1664634812 has 12 divisors (see below), whose sum is σ = 2968075656. Its totient is φ = 816613200.

The previous prime is 1664634799. The next prime is 1664634817. The reversal of 1664634812 is 2184364661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1664634812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664634817) 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 3 ways as a sum of consecutive naturals, for example, 3925814 + ... + 3926237.

It is an arithmetic number, because the mean of its divisors is an integer number (247339638).

Almost surely, 2^1664634812 is an apocalyptic number.

It is an amenable number.

1664634812 is a deficient number, since it is larger than the sum of its proper divisors (1303440844).

1664634812 is a wasteful number, since it uses less digits than its factorization.

1664634812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7852108 (or 7852106 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 1664634812 is about 40799.9364215191. The cubic root of 1664634812 is about 1185.1490995547.

The spelling of 1664634812 in words is "one billion, six hundred sixty-four million, six hundred thirty-four thousand, eight hundred twelve".