16660505 has 12 divisors (see below), whose sum is σ = 20308836. Its totient is φ = 13120800.

The previous prime is 16660499. The next prime is 16660517. The reversal of 16660505 is 50506661.

It can be written as a sum of positive squares in 2 ways, for example, as 9759376 + 6901129 = 3124^2 + 2627^2 .

It is not a de Polignac number, because 16660505 - 2¹⁰ = 16659481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24875 + ... + 25535.

It is an arithmetic number, because the mean of its divisors is an integer number (1692403).

Almost surely, 2^16660505 is an apocalyptic number.

It is an amenable number.

16660505 is a deficient number, since it is larger than the sum of its proper divisors (3648331).

16660505 is an frugal number, since it uses more digits than its factorization.

16660505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 16660505 is about 4081.7281879126. The cubic root of 16660505 is about 255.4049952960.

The spelling of 16660505 in words is "sixteen million, six hundred sixty thousand, five hundred five".