16509868306 has 4 divisors (see below), whose sum is σ = 24764802462. Its totient is φ = 8254934152.

The previous prime is 16509868289. The next prime is 16509868321. The reversal of 16509868306 is 60386890561.

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

It can be written as a sum of positive squares in only one way, i.e., 12646127025 + 3863741281 = 112455^2 + 62159^2 .

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 as a sum of consecutive naturals, namely, 4127467075 + ... + 4127467078.

Almost surely, 2^16509868306 is an apocalyptic number.

16509868306 is a deficient number, since it is larger than the sum of its proper divisors (8254934156).

16509868306 is an equidigital number, since it uses as much as digits as its factorization.

16509868306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8254934155.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 16509868306 in words is "sixteen billion, five hundred nine million, eight hundred sixty-eight thousand, three hundred six".