16389395081 has 4 divisors (see below), whose sum is σ = 16433334852. Its totient is φ = 16345455312.

The previous prime is 16389395059. The next prime is 16389395093. The reversal of 16389395081 is 18059398361.

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 12834850681 + 3554544400 = 113291^2 + 59620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16389395081 is a prime.

It is a super-2 number, since 2×16389395081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16389395681) 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, 21969326 + ... + 21970071.

It is an arithmetic number, because the mean of its divisors is an integer number (4108333713).

Almost surely, 2^16389395081 is an apocalyptic number.

It is an amenable number.

16389395081 is a deficient number, since it is larger than the sum of its proper divisors (43939771).

16389395081 is an equidigital number, since it uses as much as digits as its factorization.

16389395081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43939770.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 16389395081 in words is "sixteen billion, three hundred eighty-nine million, three hundred ninety-five thousand, eighty-one".