8125553565 has 12 divisors (see below), whose sum is σ = 14084292924. Its totient is φ = 4333628544.

The previous prime is 8125553549. The next prime is 8125553621. The reversal of 8125553565 is 5653555218.

It is a happy number.

8125553565 is a `hidden beast` number, since 8 + 1 + 2 + 55 + 535 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2246191236 + 5879362329 = 47394^2 + 76677^2 .

It is not a de Polignac number, because 8125553565 - 2⁴ = 8125553549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 180567857 = 8125553565 / (8 + 1 + 2 + 5 + 5 + 5 + 3 + 5 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 8125553565.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 90283884 + ... + 90283973.

It is an arithmetic number, because the mean of its divisors is an integer number (1173691077).

Almost surely, 2^8125553565 is an apocalyptic number.

It is an amenable number.

8125553565 is a deficient number, since it is larger than the sum of its proper divisors (5958739359).

8125553565 is a wasteful number, since it uses less digits than its factorization.

8125553565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180567868 (or 180567865 counting only the distinct ones).

The product of its digits is 900000, while the sum is 45.

The square root of 8125553565 is about 90141.8524604415. The cubic root of 8125553565 is about 2010.4085343204.

The spelling of 8125553565 in words is "eight billion, one hundred twenty-five million, five hundred fifty-three thousand, five hundred sixty-five".