16486781209 has 4 divisors (see below), whose sum is σ = 16577868580. Its totient is φ = 16395693840.

The previous prime is 16486781191. The next prime is 16486781239. The reversal of 16486781209 is 90218768461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 315843984 + 16170937225 = 17772^2 + 127165^2 .

It is a cyclic number.

It is not a de Polignac number, because 16486781209 - 2⁵ = 16486781177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16486781239) 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, 45543414 + ... + 45543775.

It is an arithmetic number, because the mean of its divisors is an integer number (4144467145).

Almost surely, 2^16486781209 is an apocalyptic number.

It is an amenable number.

16486781209 is a deficient number, since it is larger than the sum of its proper divisors (91087371).

16486781209 is an equidigital number, since it uses as much as digits as its factorization.

16486781209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91087370.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 16486781209 in words is "sixteen billion, four hundred eighty-six million, seven hundred eighty-one thousand, two hundred nine".