15916798225 has 12 divisors (see below), whose sum is σ = 19740259980. Its totient is φ = 12731225600.

The previous prime is 15916798153. The next prime is 15916798279. The reversal of 15916798225 is 52289761951.

It can be written as a sum of positive squares in 6 ways, for example, as 2556212481 + 13360585744 = 50559^2 + 115588^2 .

It is not a de Polignac number, because 15916798225 - 2⁹ = 15916797713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99945 + ... + 204505.

It is an arithmetic number, because the mean of its divisors is an integer number (1645021665).

Almost surely, 2^15916798225 is an apocalyptic number.

It is an amenable number.

15916798225 is a deficient number, since it is larger than the sum of its proper divisors (3823461755).

15916798225 is a wasteful number, since it uses less digits than its factorization.

15916798225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110660 (or 110655 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 55.

The spelling of 15916798225 in words is "fifteen billion, nine hundred sixteen million, seven hundred ninety-eight thousand, two hundred twenty-five".