1668350018 has 4 divisors (see below), whose sum is σ = 2502525030. Its totient is φ = 834175008.

The previous prime is 1668349997. The next prime is 1668350039. The reversal of 1668350018 is 8100538661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8100538661 = 1709 ⋅4739929.

It is an interprime number because it is at equal distance from previous prime (1668349997) and next prime (1668350039).

It can be written as a sum of positive squares in only one way, i.e., 1168067329 + 500282689 = 34177^2 + 22367^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417087503 + ... + 417087506.

Almost surely, 2^1668350018 is an apocalyptic number.

1668350018 is a deficient number, since it is larger than the sum of its proper divisors (834175012).

1668350018 is an equidigital number, since it uses as much as digits as its factorization.

1668350018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834175011.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 1668350018 is about 40845.4406023488. The cubic root of 1668350018 is about 1186.0301339236.

Adding to 1668350018 its reverse (8100538661), we get a palindrome (9768888679).

The spelling of 1668350018 in words is "one billion, six hundred sixty-eight million, three hundred fifty thousand, eighteen".