1664554321 has 8 divisors (see below), whose sum is σ = 1740475584. Its totient is φ = 1588928880.

The previous prime is 1664554301. The next prime is 1664554327. The reversal of 1664554321 is 1234554661.

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 1664554321 - 2⁵ = 1664554289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664554327) 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, 62406 + ... + 84991.

It is an arithmetic number, because the mean of its divisors is an integer number (217559448).

Almost surely, 2^1664554321 is an apocalyptic number.

It is an amenable number.

1664554321 is a deficient number, since it is larger than the sum of its proper divisors (75921263).

1664554321 is a wasteful number, since it uses less digits than its factorization.

1664554321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147911.

The product of its digits is 86400, while the sum is 37.

The square root of 1664554321 is about 40798.9499987438. The cubic root of 1664554321 is about 1185.1299971920.

It can be divided in two parts, 1664 and 554321, that added together give a triangular number (555985 = T₁₀₅₄).

The spelling of 1664554321 in words is "one billion, six hundred sixty-four million, five hundred fifty-four thousand, three hundred twenty-one".