6561210100725 has 72 divisors (see below), whose sum is σ = 13431313501632. Its totient is φ = 2999271744000.

The previous prime is 6561210100663. The next prime is 6561210100777. The reversal of 6561210100725 is 5270010121656.

6561210100725 is a `hidden beast` number, since 6 + 5 + 612 + 1 + 0 + 10 + 0 + 7 + 25 = 666.

It is not a de Polignac number, because 6561210100725 - 2⁹ = 6561210100213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6561210100725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 39056509 + ... + 39224141.

It is an arithmetic number, because the mean of its divisors is an integer number (186546020856).

Almost surely, 2^{6561210100725} is an apocalyptic number.

It is an amenable number.

6561210100725 is an abundant number, since it is smaller than the sum of its proper divisors (6870103400907).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6561210100725 is a wasteful number, since it uses less digits than its factorization.

6561210100725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192507 (or 192499 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 6561210100725 in words is "six trillion, five hundred sixty-one billion, two hundred ten million, one hundred thousand, seven hundred twenty-five".