6781545012564 has 72 divisors (see below), whose sum is σ = 19591937776320. Its totient is φ = 1937504403072.

The previous prime is 6781545012563. The next prime is 6781545012587. The reversal of 6781545012564 is 4652105451876.

6781545012564 is a `hidden beast` number, since 6 + 7 + 8 + 1 + 5 + 450 + 125 + 64 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 6781545012564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6781545012563) 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 23 ways as a sum of consecutive naturals, for example, 5709507 + ... + 6794229.

Almost surely, 2^{6781545012564} is an apocalyptic number.

It is an amenable number.

6781545012564 is an abundant number, since it is smaller than the sum of its proper divisors (12810392763756).

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

6781545012564 is a wasteful number, since it uses less digits than its factorization.

6781545012564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109549 (or 1109544 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 54.

The spelling of 6781545012564 in words is "six trillion, seven hundred eighty-one billion, five hundred forty-five million, twelve thousand, five hundred sixty-four".