6561489526368 has 48 divisors (see below), whose sum is σ = 19684468581120. Its totient is φ = 1874711293056.

The previous prime is 6561489526367. The next prime is 6561489526393. The reversal of 6561489526368 is 8636259841656.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561489526367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4882059988 + ... + 4882061331.

It is an arithmetic number, because the mean of its divisors is an integer number (410093095440).

Almost surely, 2^{6561489526368} is an apocalyptic number.

It is an amenable number.

6561489526368 is an abundant number, since it is smaller than the sum of its proper divisors (13122979054752).

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

6561489526368 is a wasteful number, since it uses less digits than its factorization.

6561489526368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9764121339 (or 9764121331 counting only the distinct ones).

The product of its digits is 447897600, while the sum is 69.

The spelling of 6561489526368 in words is "six trillion, five hundred sixty-one billion, four hundred eighty-nine million, five hundred twenty-six thousand, three hundred sixty-eight".