1664735073 has 8 divisors (see below), whose sum is σ = 2219961600. Its totient is φ = 1109665968.

The previous prime is 1664735063. The next prime is 1664735077. The reversal of 1664735073 is 3705374661.

It is a happy number.

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

It is not a de Polignac number, because 1664735073 - 2⁴ = 1664735057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664735077) 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 7 ways as a sum of consecutive naturals, for example, 11953 + ... + 58926.

It is an arithmetic number, because the mean of its divisors is an integer number (277495200).

Almost surely, 2^1664735073 is an apocalyptic number.

It is an amenable number.

1664735073 is a deficient number, since it is larger than the sum of its proper divisors (555226527).

1664735073 is an equidigital number, since it uses as much as digits as its factorization.

1664735073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78711.

The product of its (nonzero) digits is 317520, while the sum is 42.

The square root of 1664735073 is about 40801.1650936588. The cubic root of 1664735073 is about 1185.1728929312.

The spelling of 1664735073 in words is "one billion, six hundred sixty-four million, seven hundred thirty-five thousand, seventy-three".