1668499445 has 8 divisors (see below), whose sum is σ = 2014953144. Its totient is φ = 1326297024.

The previous prime is 1668499411. The next prime is 1668499451. The reversal of 1668499445 is 5449948661.

It can be written as a sum of positive squares in 4 ways, for example, as 311240164 + 1357259281 = 17642^2 + 36841^2 .

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 1668499445 - 2¹⁰ = 1668498421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1061954 + ... + 1063523.

It is an arithmetic number, because the mean of its divisors is an integer number (251869143).

Almost surely, 2^1668499445 is an apocalyptic number.

It is an amenable number.

1668499445 is a deficient number, since it is larger than the sum of its proper divisors (346453699).

1668499445 is a wasteful number, since it uses less digits than its factorization.

1668499445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125639.

The product of its digits is 7464960, while the sum is 56.

The square root of 1668499445 is about 40847.2697374011. The cubic root of 1668499445 is about 1186.0655420878.

The spelling of 1668499445 in words is "one billion, six hundred sixty-eight million, four hundred ninety-nine thousand, four hundred forty-five".