1668506818 has 16 divisors (see below), whose sum is σ = 2755336320. Its totient is φ = 751453200.

The previous prime is 1668506773. The next prime is 1668506821. The reversal of 1668506818 is 8186058661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345498 + ... + 350293.

It is an arithmetic number, because the mean of its divisors is an integer number (172208520).

Almost surely, 2^1668506818 is an apocalyptic number.

1668506818 is a deficient number, since it is larger than the sum of its proper divisors (1086829502).

1668506818 is a wasteful number, since it uses less digits than its factorization.

1668506818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695913.

The product of its (nonzero) digits is 552960, while the sum is 49.

The square root of 1668506818 is about 40847.3599881314. The cubic root of 1668506818 is about 1186.0672891363.

The spelling of 1668506818 in words is "one billion, six hundred sixty-eight million, five hundred six thousand, eight hundred eighteen".