6561705112225 has 12 divisors (see below), whose sum is σ = 8417083800060. Its totient is φ = 5068351534400.

The previous prime is 6561705112219. The next prime is 6561705112231. The reversal of 6561705112225 is 5222115071656.

It is an interprime number because it is at equal distance from previous prime (6561705112219) and next prime (6561705112231).

It can be written as a sum of positive squares in 6 ways, for example, as 262850010721 + 6298855101504 = 512689^2 + 2509752^2 .

It is not a de Polignac number, because 6561705112225 - 2²⁷ = 6561570894497 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, 4525313146 + ... + 4525314595.

It is an arithmetic number, because the mean of its divisors is an integer number (701423650005).

Almost surely, 2^{6561705112225} is an apocalyptic number.

It is an amenable number.

6561705112225 is a deficient number, since it is larger than the sum of its proper divisors (1855378687835).

6561705112225 is a wasteful number, since it uses less digits than its factorization.

6561705112225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9050627780 (or 9050627775 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 6561705112225 in words is "six trillion, five hundred sixty-one billion, seven hundred five million, one hundred twelve thousand, two hundred twenty-five".