16388219689 has 4 divisors (see below), whose sum is σ = 16414954756. Its totient is φ = 16361484624.

The previous prime is 16388219681. The next prime is 16388219699. The reversal of 16388219689 is 98691288361.

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 7720609689 + 8667610000 = 87867^2 + 93100^2 .

It is a cyclic number.

It is not a de Polignac number, because 16388219689 - 2³ = 16388219681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16388219681) 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, 13366614 + ... + 13367839.

It is an arithmetic number, because the mean of its divisors is an integer number (4103738689).

Almost surely, 2^16388219689 is an apocalyptic number.

It is an amenable number.

16388219689 is a deficient number, since it is larger than the sum of its proper divisors (26735067).

16388219689 is an equidigital number, since it uses as much as digits as its factorization.

16388219689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26735066.

The product of its digits is 8957952, while the sum is 61.

The spelling of 16388219689 in words is "sixteen billion, three hundred eighty-eight million, two hundred nineteen thousand, six hundred eighty-nine".