16688065 has 8 divisors (see below), whose sum is σ = 20056680. Its totient is φ = 13329792.

The previous prime is 16688059. The next prime is 16688081. The reversal of 16688065 is 56088661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 269361 + 16418704 = 519^2 + 4052^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16688065 is a prime.

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, 1581 + ... + 5989.

It is an arithmetic number, because the mean of its divisors is an integer number (2507085).

Almost surely, 2^16688065 is an apocalyptic number.

It is an amenable number.

16688065 is a deficient number, since it is larger than the sum of its proper divisors (3368615).

16688065 is an equidigital number, since it uses as much as digits as its factorization.

16688065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 16688065 is about 4085.1028138836. The cubic root of 16688065 is about 255.5457490111.

The spelling of 16688065 in words is "sixteen million, six hundred eighty-eight thousand, sixty-five".