6561873144 has 48 divisors (see below), whose sum is σ = 17839364400. Its totient is φ = 2178968064.

The previous prime is 6561873121. The next prime is 6561873161. The reversal of 6561873144 is 4413781656.

6561873144 is a `hidden beast` number, since 6 + 561 + 8 + 73 + 14 + 4 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 6561873144.

It is a congruent number.

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, 154329 + ... + 192200.

It is an arithmetic number, because the mean of its divisors is an integer number (371653425).

Almost surely, 2^6561873144 is an apocalyptic number.

It is an amenable number.

6561873144 is an abundant number, since it is smaller than the sum of its proper divisors (11277491256).

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

6561873144 is a wasteful number, since it uses less digits than its factorization.

6561873144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346804 (or 346797 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 6561873144 is about 81005.3895984705. The cubic root of 6561873144 is about 1872.1584829117.

The spelling of 6561873144 in words is "six billion, five hundred sixty-one million, eight hundred seventy-three thousand, one hundred forty-four".