27561170225 has 12 divisors (see below), whose sum is σ = 34425314124. Its totient is φ = 21887992320.

The previous prime is 27561170201. The next prime is 27561170281. The reversal of 27561170225 is 52207116572.

It can be written as a sum of positive squares in 6 ways, for example, as 428821264 + 27132348961 = 20708^2 + 164719^2 .

It is a de Polignac number, because none of the positive numbers 2^k-27561170225 is a prime.

It is a Duffinian number.

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, 4020104 + ... + 4026953.

It is an arithmetic number, because the mean of its divisors is an integer number (2868776177).

Almost surely, 2^27561170225 is an apocalyptic number.

27561170225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

27561170225 is a deficient number, since it is larger than the sum of its proper divisors (6864143899).

27561170225 is a wasteful number, since it uses less digits than its factorization.

27561170225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8047204 (or 8047199 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 38.

Adding to 27561170225 its reverse (52207116572), we get a palindrome (79768286797).

The spelling of 27561170225 in words is "twenty-seven billion, five hundred sixty-one million, one hundred seventy thousand, two hundred twenty-five".