6561111056 has 10 divisors (see below), whose sum is σ = 12712152702. Its totient is φ = 3280555520.

The previous prime is 6561111049. The next prime is 6561111079. The reversal of 6561111056 is 6501111656.

It can be written as a sum of positive squares in only one way, i.e., 6206918656 + 354192400 = 78784^2 + 18820^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205034705 + ... + 205034736.

Almost surely, 2^6561111056 is an apocalyptic number.

It is an amenable number.

6561111056 is a deficient number, since it is larger than the sum of its proper divisors (6151041646).

6561111056 is a wasteful number, since it uses less digits than its factorization.

6561111056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410069449 (or 410069443 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 6561111056 is about 81000.6855279633. The cubic root of 6561111056 is about 1872.0860033661.

It can be divided in two parts, 65611 and 11056, that added together give a palindrome (76667).

The spelling of 6561111056 in words is "six billion, five hundred sixty-one million, one hundred eleven thousand, fifty-six".