6561557875325 has 12 divisors (see below), whose sum is σ = 8148421432308. Its totient is φ = 5241446515200.

The previous prime is 6561557875321. The next prime is 6561557875337. The reversal of 6561557875325 is 5235787551656.

It can be written as a sum of positive squares in 6 ways, for example, as 371946295876 + 6189611579449 = 609874^2 + 2487893^2 .

It is not a de Polignac number, because 6561557875325 - 2² = 6561557875321 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561557875321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194977466 + ... + 195011115.

It is an arithmetic number, because the mean of its divisors is an integer number (679035119359).

Almost surely, 2^{6561557875325} is an apocalyptic number.

It is an amenable number.

6561557875325 is a deficient number, since it is larger than the sum of its proper divisors (1586863556983).

6561557875325 is a wasteful number, since it uses less digits than its factorization.

6561557875325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389989264 (or 389989259 counting only the distinct ones).

The product of its digits is 264600000, while the sum is 65.

The spelling of 6561557875325 in words is "six trillion, five hundred sixty-one billion, five hundred fifty-seven million, eight hundred seventy-five thousand, three hundred twenty-five".