1666685018 has 8 divisors (see below), whose sum is σ = 2608724448. Its totient is φ = 797110204.

The previous prime is 1666684993. The next prime is 1666685021. The reversal of 1666685018 is 8105866661.

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, 18116096 + ... + 18116187.

It is an arithmetic number, because the mean of its divisors is an integer number (326090556).

Almost surely, 2^1666685018 is an apocalyptic number.

1666685018 is a deficient number, since it is larger than the sum of its proper divisors (942039430).

1666685018 is a wasteful number, since it uses less digits than its factorization.

1666685018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36232308.

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 1666685018 is about 40825.0538027814. The cubic root of 1666685018 is about 1185.6354530630.

The spelling of 1666685018 in words is "one billion, six hundred sixty-six million, six hundred eighty-five thousand, eighteen".