16457513209 has 4 divisors (see below), whose sum is σ = 16484361316. Its totient is φ = 16430665104.

The previous prime is 16457513203. The next prime is 16457513243. The reversal of 16457513209 is 90231575461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90231575461 = 17 ⋅5307739733.

It can be written as a sum of positive squares in 2 ways, for example, as 125440000 + 16332073209 = 11200^2 + 127797^2 .

It is a cyclic number.

It is not a de Polignac number, because 16457513209 - 2¹⁵ = 16457480441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16457513203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13423134 + ... + 13424359.

It is an arithmetic number, because the mean of its divisors is an integer number (4121090329).

Almost surely, 2^16457513209 is an apocalyptic number.

It is an amenable number.

16457513209 is a deficient number, since it is larger than the sum of its proper divisors (26848107).

16457513209 is an equidigital number, since it uses as much as digits as its factorization.

16457513209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26848106.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 16457513209 in words is "sixteen billion, four hundred fifty-seven million, five hundred thirteen thousand, two hundred nine".