815575165225 has 12 divisors (see below), whose sum is σ = 1012995941020. Its totient is φ = 651374496000.

The previous prime is 815575165199. The next prime is 815575165253. The reversal of 815575165225 is 522561575518.

It can be written as a sum of positive squares in 6 ways, for example, as 4761 + 815575160464 = 69^2 + 903092^2 .

It is not a de Polignac number, because 815575165225 - 2¹¹ = 815575163177 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27125580 + ... + 27155629.

Almost surely, 2^815575165225 is an apocalyptic number.

It is an amenable number.

815575165225 is a deficient number, since it is larger than the sum of its proper divisors (197420775795).

815575165225 is a wasteful number, since it uses less digits than its factorization.

815575165225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54281820 (or 54281815 counting only the distinct ones).

The product of its digits is 4200000, while the sum is 52.

The spelling of 815575165225 in words is "eight hundred fifteen billion, five hundred seventy-five million, one hundred sixty-five thousand, two hundred twenty-five".