16389897925 has 6 divisors (see below), whose sum is σ = 20323473458. Its totient is φ = 13111918320.

The previous prime is 16389897919. The next prime is 16389897941. The reversal of 16389897925 is 52979898361.

It can be written as a sum of positive squares in 3 ways, for example, as 3262008996 + 13127888929 = 57114^2 + 114577^2 .

It is not a de Polignac number, because 16389897925 - 2⁵ = 16389897893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 327797934 + ... + 327797983.

Almost surely, 2^16389897925 is an apocalyptic number.

It is an amenable number.

16389897925 is a deficient number, since it is larger than the sum of its proper divisors (3933575533).

16389897925 is an equidigital number, since it uses as much as digits as its factorization.

16389897925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655595927 (or 655595922 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 67.

The spelling of 16389897925 in words is "sixteen billion, three hundred eighty-nine million, eight hundred ninety-seven thousand, nine hundred twenty-five".