1663684916 has 24 divisors (see below), whose sum is σ = 3066161280. Its totient is φ = 787681152.

The previous prime is 1663684901. The next prime is 1663684933. The reversal of 1663684916 is 6194863661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211445 + ... + 219171.

It is an arithmetic number, because the mean of its divisors is an integer number (127756720).

Almost surely, 2^1663684916 is an apocalyptic number.

It is an amenable number.

1663684916 is a deficient number, since it is larger than the sum of its proper divisors (1402476364).

1663684916 is a wasteful number, since it uses less digits than its factorization.

1663684916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10583 (or 10581 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The square root of 1663684916 is about 40788.2938598809. The cubic root of 1663684916 is about 1184.9236281615.

The spelling of 1663684916 in words is "one billion, six hundred sixty-three million, six hundred eighty-four thousand, nine hundred sixteen".