1681603806 has 8 divisors (see below), whose sum is σ = 3363207624. Its totient is φ = 560534600.

The previous prime is 1681603793. The next prime is 1681603811. The reversal of 1681603806 is 6083061861.

It is a sphenic number, since it is the product of 3 distinct primes.

1681603806 is an admirable number.

It is a congruent number.

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, 140133645 + ... + 140133656.

It is an arithmetic number, because the mean of its divisors is an integer number (420400953).

Almost surely, 2^1681603806 is an apocalyptic number.

1681603806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1681603806 is a wasteful number, since it uses less digits than its factorization.

1681603806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280267306.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1681603806 is about 41007.3628266925. The cubic root of 1681603806 is about 1189.1625598298.

The spelling of 1681603806 in words is "one billion, six hundred eighty-one million, six hundred three thousand, eight hundred six".