1683666687 has 8 divisors (see below), whose sum is σ = 2246632960. Its totient is φ = 1121572440.

The previous prime is 1683666683. The next prime is 1683666697. The reversal of 1683666687 is 7866663861.

It is a happy number.

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

It is not a de Polignac number, because 1683666687 - 2² = 1683666683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1683666683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213487 + ... + 221232.

It is an arithmetic number, because the mean of its divisors is an integer number (280829120).

Almost surely, 2^1683666687 is an apocalyptic number.

1683666687 is a deficient number, since it is larger than the sum of its proper divisors (562966273).

1683666687 is a wasteful number, since it uses less digits than its factorization.

1683666687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436013.

The product of its digits is 10450944, while the sum is 57.

The square root of 1683666687 is about 41032.5076859799. The cubic root of 1683666687 is about 1189.6486232778.

The spelling of 1683666687 in words is "one billion, six hundred eighty-three million, six hundred sixty-six thousand, six hundred eighty-seven".