1664554319 has 4 divisors (see below), whose sum is σ = 1664672640. Its totient is φ = 1664436000.

The previous prime is 1664554301. The next prime is 1664554327. The reversal of 1664554319 is 9134554661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9134554661 = 263 ⋅34732147.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664554319 is a prime.

It is a super-2 number, since 2×1664554319² = 5541482161803107522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1664554319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664554379) 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, 34682 + ... + 67319.

It is an arithmetic number, because the mean of its divisors is an integer number (416168160).

Almost surely, 2^1664554319 is an apocalyptic number.

1664554319 is a deficient number, since it is larger than the sum of its proper divisors (118321).

1664554319 is a wasteful number, since it uses less digits than its factorization.

1664554319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118320.

The product of its digits is 388800, while the sum is 44.

The square root of 1664554319 is about 40798.9499742334. The cubic root of 1664554319 is about 1185.1299967174.

The spelling of 1664554319 in words is "one billion, six hundred sixty-four million, five hundred fifty-four thousand, three hundred nineteen".