1680338018 has 4 divisors (see below), whose sum is σ = 2520507030. Its totient is φ = 840169008.

The previous prime is 1680338003. The next prime is 1680338063. The reversal of 1680338018 is 8108330861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8108330861 = 193 ⋅42012077.

It can be written as a sum of positive squares in only one way, i.e., 1142237209 + 538100809 = 33797^2 + 23197^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420084503 + ... + 420084506.

Almost surely, 2^1680338018 is an apocalyptic number.

1680338018 is a deficient number, since it is larger than the sum of its proper divisors (840169012).

1680338018 is an equidigital number, since it uses as much as digits as its factorization.

1680338018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840169011.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 1680338018 is about 40991.9262538369. The cubic root of 1680338018 is about 1188.8641134843.

Adding to 1680338018 its reverse (8108330861), we get a palindrome (9788668879).

The spelling of 1680338018 in words is "one billion, six hundred eighty million, three hundred thirty-eight thousand, eighteen".