1668584449 has 16 divisors (see below), whose sum is σ = 1962631296. Its totient is φ = 1388620800.

The previous prime is 1668584399. The next prime is 1668584461. The reversal of 1668584449 is 9444858661.

It is not a de Polignac number, because 1668584449 - 2⁷ = 1668584321 is a prime.

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 1668584449.

It is not an unprimeable number, because it can be changed into a prime (1668585449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120609 + ... + 133729.

It is an arithmetic number, because the mean of its divisors is an integer number (122664456).

Almost surely, 2^1668584449 is an apocalyptic number.

It is an amenable number.

1668584449 is a deficient number, since it is larger than the sum of its proper divisors (294046847).

1668584449 is a wasteful number, since it uses less digits than its factorization.

1668584449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13656.

The product of its digits is 6635520, while the sum is 55.

The square root of 1668584449 is about 40848.3102343292. The cubic root of 1668584449 is about 1186.0856836594.

The spelling of 1668584449 in words is "one billion, six hundred sixty-eight million, five hundred eighty-four thousand, four hundred forty-nine".