16509677889 has 4 divisors (see below), whose sum is σ = 22012903856. Its totient is φ = 11006451924.

The previous prime is 16509677869. The next prime is 16509677903. The reversal of 16509677889 is 98877690561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16509677889 - 2¹¹ = 16509675841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16509677839) 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, 2751612979 + ... + 2751612984.

It is an arithmetic number, because the mean of its divisors is an integer number (5503225964).

Almost surely, 2^16509677889 is an apocalyptic number.

It is an amenable number.

16509677889 is a deficient number, since it is larger than the sum of its proper divisors (5503225967).

16509677889 is an equidigital number, since it uses as much as digits as its factorization.

16509677889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5503225966.

The product of its (nonzero) digits is 45722880, while the sum is 66.

The spelling of 16509677889 in words is "sixteen billion, five hundred nine million, six hundred seventy-seven thousand, eight hundred eighty-nine".