1680018646 has 32 divisors (see below), whose sum is σ = 2691468000. Its totient is φ = 784219392.

The previous prime is 1680018631. The next prime is 1680018671. The reversal of 1680018646 is 6468100861.

It is a junction number, because it is equal to n+sod(n) for n = 1680018599 and 1680018608.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1314960 + ... + 1316236.

It is an arithmetic number, because the mean of its divisors is an integer number (84108375).

Almost surely, 2^1680018646 is an apocalyptic number.

1680018646 is a deficient number, since it is larger than the sum of its proper divisors (1011449354).

1680018646 is a wasteful number, since it uses less digits than its factorization.

1680018646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 1680018646 is about 40988.0305211168. The cubic root of 1680018646 is about 1188.7887885669.

The spelling of 1680018646 in words is "one billion, six hundred eighty million, eighteen thousand, six hundred forty-six".