1680443618 has 24 divisors (see below), whose sum is σ = 3011469888. Its totient is φ = 688874472.

The previous prime is 1680443603. The next prime is 1680443627. The reversal of 1680443618 is 8163440861.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106046 + ... + 120857.

It is an arithmetic number, because the mean of its divisors is an integer number (125477912).

Almost surely, 2^1680443618 is an apocalyptic number.

1680443618 is a deficient number, since it is larger than the sum of its proper divisors (1331026270).

1680443618 is a wasteful number, since it uses less digits than its factorization.

1680443618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226958 (or 226935 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 1680443618 is about 40993.2142921240. The cubic root of 1680443618 is about 1188.8890174856.

The spelling of 1680443618 in words is "one billion, six hundred eighty million, four hundred forty-three thousand, six hundred eighteen".