1664534633 has 8 divisors (see below), whose sum is σ = 1765381056. Its totient is φ = 1566061200.

The previous prime is 1664534629. The next prime is 1664534639. The reversal of 1664534633 is 3364354661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664534633 - 2² = 1664534629 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664534639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591803 + ... + 594608.

It is an arithmetic number, because the mean of its divisors is an integer number (220672632).

Almost surely, 2^1664534633 is an apocalyptic number.

It is an amenable number.

1664534633 is a deficient number, since it is larger than the sum of its proper divisors (100846423).

1664534633 is a wasteful number, since it uses less digits than its factorization.

1664534633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186495.

The product of its digits is 466560, while the sum is 41.

The square root of 1664534633 is about 40798.7087173111. The cubic root of 1664534633 is about 1185.1253246838.

The spelling of 1664534633 in words is "one billion, six hundred sixty-four million, five hundred thirty-four thousand, six hundred thirty-three".