1681603996 has 12 divisors (see below), whose sum is σ = 2949606352. Its totient is φ = 838859328.

The previous prime is 1681603961. The next prime is 1681603997. The reversal of 1681603996 is 6993061861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681603997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483720 + ... + 487183.

Almost surely, 2^1681603996 is an apocalyptic number.

It is an amenable number.

1681603996 is a deficient number, since it is larger than the sum of its proper divisors (1268002356).

1681603996 is a wasteful number, since it uses less digits than its factorization.

1681603996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971340 (or 971338 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 1681603996 is about 41007.3651433496. The cubic root of 1681603996 is about 1189.1626046165.

The spelling of 1681603996 in words is "one billion, six hundred eighty-one million, six hundred three thousand, nine hundred ninety-six".