1689686668 has 24 divisors (see below), whose sum is σ = 3013653104. Its totient is φ = 828748800.

The previous prime is 1689686617. The next prime is 1689686723. The reversal of 1689686668 is 8666869861.

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, 51508 + ... + 77668.

Almost surely, 2^1689686668 is an apocalyptic number.

It is an amenable number.

1689686668 is a deficient number, since it is larger than the sum of its proper divisors (1323966436).

1689686668 is a wasteful number, since it uses less digits than its factorization.

1689686668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26473 (or 26471 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 64.

The square root of 1689686668 is about 41105.7984717485. The cubic root of 1689686668 is about 1191.0648068822.

The spelling of 1689686668 in words is "one billion, six hundred eighty-nine million, six hundred eighty-six thousand, six hundred sixty-eight".