8561612225 has 24 divisors (see below), whose sum is σ = 10963782648. Its totient is φ = 6627225600.

The previous prime is 8561612201. The next prime is 8561612231. The reversal of 8561612225 is 5222161658.

It can be written as a sum of positive squares in 12 ways, for example, as 1249481104 + 7312131121 = 35348^2 + 85511^2 .

It is not a de Polignac number, because 8561612225 - 2¹⁸ = 8561350081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141857 + ... + 192993.

It is an arithmetic number, because the mean of its divisors is an integer number (456824277).

Almost surely, 2^8561612225 is an apocalyptic number.

It is an amenable number.

8561612225 is a deficient number, since it is larger than the sum of its proper divisors (2402170423).

8561612225 is a wasteful number, since it uses less digits than its factorization.

8561612225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51365 (or 51360 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 8561612225 is about 92528.9804601780. The cubic root of 8561612225 is about 2045.7466621469.

The spelling of 8561612225 in words is "eight billion, five hundred sixty-one million, six hundred twelve thousand, two hundred twenty-five".