6561011103 has 4 divisors (see below), whose sum is σ = 8748014808. Its totient is φ = 4374007400.

The previous prime is 6561011081. The next prime is 6561011129. The reversal of 6561011103 is 3011101656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6561011103 - 2⁵ = 6561011071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561011503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093501848 + ... + 1093501853.

It is an arithmetic number, because the mean of its divisors is an integer number (2187003702).

Almost surely, 2^6561011103 is an apocalyptic number.

6561011103 is a deficient number, since it is larger than the sum of its proper divisors (2187003705).

6561011103 is a wasteful number, since it uses less digits than its factorization.

6561011103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2187003704.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 6561011103 is about 81000.0685370080. The cubic root of 6561011103 is about 1872.0764967667.

Adding to 6561011103 its reverse (3011101656), we get a palindrome (9572112759).

The spelling of 6561011103 in words is "six billion, five hundred sixty-one million, eleven thousand, one hundred three".