16428581425 has 6 divisors (see below), whose sum is σ = 20371440998. Its totient is φ = 13142865120.

The previous prime is 16428581417. The next prime is 16428581483. The reversal of 16428581425 is 52418582461.

It can be written as a sum of positive squares in 3 ways, for example, as 519841 + 16428061584 = 721^2 + 128172^2 .

It is not a de Polignac number, because 16428581425 - 2³ = 16428581417 is a prime.

It is a Duffinian 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, 328571604 + ... + 328571653.

Almost surely, 2^16428581425 is an apocalyptic number.

It is an amenable number.

16428581425 is a deficient number, since it is larger than the sum of its proper divisors (3942859573).

16428581425 is an equidigital number, since it uses as much as digits as its factorization.

16428581425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657143267 (or 657143262 counting only the distinct ones).

The product of its digits is 614400, while the sum is 46.

The spelling of 16428581425 in words is "sixteen billion, four hundred twenty-eight million, five hundred eighty-one thousand, four hundred twenty-five".