1664433329 has 8 divisors (see below), whose sum is σ = 1792801920. Its totient is φ = 1536112656.

The previous prime is 1664433319. The next prime is 1664433347. The reversal of 1664433329 is 9233344661.

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

It is not a de Polignac number, because 1664433329 - 2⁴ = 1664433313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664433319) 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, 96824 + ... + 112710.

It is an arithmetic number, because the mean of its divisors is an integer number (224100240).

Almost surely, 2^1664433329 is an apocalyptic number.

It is an amenable number.

1664433329 is a deficient number, since it is larger than the sum of its proper divisors (128368591).

1664433329 is a wasteful number, since it uses less digits than its factorization.

1664433329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23959.

The product of its digits is 279936, while the sum is 41.

The square root of 1664433329 is about 40797.4671885400. The cubic root of 1664433329 is about 1185.1012818534.

The spelling of 1664433329 in words is "one billion, six hundred sixty-four million, four hundred thirty-three thousand, three hundred twenty-nine".