15955609825 has 6 divisors (see below), whose sum is σ = 19784956214. Its totient is φ = 12764487840.

The previous prime is 15955609807. The next prime is 15955609853. The reversal of 15955609825 is 52890655951.

It is a happy number.

15955609825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 3155855329 + 12799754496 = 56177^2 + 113136^2 .

It is not a de Polignac number, because 15955609825 - 2¹¹ = 15955607777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 319112172 + ... + 319112221.

Almost surely, 2^15955609825 is an apocalyptic number.

It is an amenable number.

15955609825 is a deficient number, since it is larger than the sum of its proper divisors (3829346389).

15955609825 is an equidigital number, since it uses as much as digits as its factorization.

15955609825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638224403 (or 638224398 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 55.

The spelling of 15955609825 in words is "fifteen billion, nine hundred fifty-five million, six hundred nine thousand, eight hundred twenty-five".