6561128677770 has 48 divisors (see below), whose sum is σ = 17070360855912. Its totient is φ = 1748462386560.

The previous prime is 6561128677769. The next prime is 6561128677787. The reversal of 6561128677770 is 777768211656.

6561128677770 is a `hidden beast` number, since 6 + 5 + 611 + 2 + 8 + 6 + 7 + 7 + 7 + 7 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4343510323881 + 2217618353889 = 2084109^2 + 1489167^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6561128677698 and 6561128677707.

It is an unprimeable number.

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, 24280041 + ... + 24548780.

Almost surely, 2^{6561128677770} is an apocalyptic number.

6561128677770 is an abundant number, since it is smaller than the sum of its proper divisors (10509232178142).

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

6561128677770 is a wasteful number, since it uses less digits than its factorization.

6561128677770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48830327 (or 48830324 counting only the distinct ones).

The product of its (nonzero) digits is 41489280, while the sum is 63.

The spelling of 6561128677770 in words is "six trillion, five hundred sixty-one billion, one hundred twenty-eight million, six hundred seventy-seven thousand, seven hundred seventy".