1689666911 has 4 divisors (see below), whose sum is σ = 1691180712. Its totient is φ = 1688153112.

The previous prime is 1689666863. The next prime is 1689666947. The reversal of 1689666911 is 1196669861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1196669861 = 449 ⋅2665189.

It is a cyclic number.

It is not a de Polignac number, because 1689666911 - 2³⁰ = 615925087 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 (1689666611) 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, 755225 + ... + 757458.

It is an arithmetic number, because the mean of its divisors is an integer number (422795178).

Almost surely, 2^1689666911 is an apocalyptic number.

1689666911 is a deficient number, since it is larger than the sum of its proper divisors (1513801).

1689666911 is a wasteful number, since it uses less digits than its factorization.

1689666911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513800.

The product of its digits is 839808, while the sum is 53.

The square root of 1689666911 is about 41105.5581521526. The cubic root of 1689666911 is about 1191.0601646095.

The spelling of 1689666911 in words is "one billion, six hundred eighty-nine million, six hundred sixty-six thousand, nine hundred eleven".