1668333538 has 8 divisors (see below), whose sum is σ = 2503709100. Its totient is φ = 833763840.

The previous prime is 1668333517. The next prime is 1668333559. The reversal of 1668333538 is 8353338661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1668333517) and next prime (1668333559).

It can be written as a sum of positive squares in 2 ways, for example, as 1665211249 + 3122289 = 40807^2 + 1767^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196263 + ... + 204586.

Almost surely, 2^1668333538 is an apocalyptic number.

1668333538 is a deficient number, since it is larger than the sum of its proper divisors (835375562).

1668333538 is a wasteful number, since it uses less digits than its factorization.

1668333538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402932.

The product of its digits is 933120, while the sum is 46.

The square root of 1668333538 is about 40845.2388657479. The cubic root of 1668333538 is about 1186.0262286997.

The spelling of 1668333538 in words is "one billion, six hundred sixty-eight million, three hundred thirty-three thousand, five hundred thirty-eight".