1680018666 has 16 divisors (see below), whose sum is σ = 3431528064. Its totient is φ = 548091104.

The previous prime is 1680018631. The next prime is 1680018671. The reversal of 1680018666 is 6668100861.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2978475 + ... + 2979038.

It is an arithmetic number, because the mean of its divisors is an integer number (214470504).

Almost surely, 2^1680018666 is an apocalyptic number.

1680018666 is an abundant number, since it is smaller than the sum of its proper divisors (1751509398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1680018666 is a wasteful number, since it uses less digits than its factorization.

1680018666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957565.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 1680018666 is about 40988.0307650904. The cubic root of 1680018666 is about 1188.7887932842.

The spelling of 1680018666 in words is "one billion, six hundred eighty million, eighteen thousand, six hundred sixty-six".