16689545 has 4 divisors (see below), whose sum is σ = 20027460. Its totient is φ = 13351632.

The previous prime is 16689523. The next prime is 16689593. The reversal of 16689545 is 54598661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12313081 + 4376464 = 3509^2 + 2092^2 .

It is a cyclic number.

It is not a de Polignac number, because 16689545 - 2⁶ = 16689481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16689496 and 16689505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668950 + ... + 1668959.

It is an arithmetic number, because the mean of its divisors is an integer number (5006865).

Almost surely, 2^16689545 is an apocalyptic number.

It is an amenable number.

16689545 is a deficient number, since it is larger than the sum of its proper divisors (3337915).

16689545 is an equidigital number, since it uses as much as digits as its factorization.

16689545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3337914.

The product of its digits is 259200, while the sum is 44.

The square root of 16689545 is about 4085.2839558591. The cubic root of 16689545 is about 255.5533032428.

The spelling of 16689545 in words is "sixteen million, six hundred eighty-nine thousand, five hundred forty-five".