16688597 has 2 divisors, whose sum is σ = 16688598. Its totient is φ = 16688596.

The previous prime is 16688579. The next prime is 16688627. The reversal of 16688597 is 79588661.

It is a happy number.

Together with previous prime (16688579) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8814961 + 7873636 = 2969^2 + 2806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16688597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16688557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8344298 + 8344299.

It is an arithmetic number, because the mean of its divisors is an integer number (8344299).

Almost surely, 2^16688597 is an apocalyptic number.

It is an amenable number.

16688597 is a deficient number, since it is larger than the sum of its proper divisors (1).

16688597 is an equidigital number, since it uses as much as digits as its factorization.

16688597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The square root of 16688597 is about 4085.1679280049. The cubic root of 16688597 is about 255.5484645025.

The spelling of 16688597 in words is "sixteen million, six hundred eighty-eight thousand, five hundred ninety-seven".