6561601101 has 20 divisors (see below), whose sum is σ = 10692981024. Its totient is φ = 3976727400.

The previous prime is 6561601097. The next prime is 6561601117. The reversal of 6561601101 is 1011061656.

6561601101 is a `hidden beast` number, since 6 + 56 + 1 + 601 + 1 + 0 + 1 = 666.

It is not a de Polignac number, because 6561601101 - 2² = 6561601097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561601801) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3681265 + ... + 3683046.

Almost surely, 2^6561601101 is an apocalyptic number.

It is an amenable number.

6561601101 is a deficient number, since it is larger than the sum of its proper divisors (4131379923).

6561601101 is a wasteful number, since it uses less digits than its factorization.

6561601101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7364334 (or 7364325 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 6561601101 is about 81003.7104150174. The cubic root of 6561601101 is about 1872.1326104899.

Adding to 6561601101 its reverse (1011061656), we get a palindrome (7572662757).

The spelling of 6561601101 in words is "six billion, five hundred sixty-one million, six hundred one thousand, one hundred one".