6561005101 has 4 divisors (see below), whose sum is σ = 7498291552. Its totient is φ = 5623718652.

The previous prime is 6561005089. The next prime is 6561005123. The reversal of 6561005101 is 1015001656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6561005101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561005161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468643215 + ... + 468643228.

It is an arithmetic number, because the mean of its divisors is an integer number (1874572888).

Almost surely, 2^6561005101 is an apocalyptic number.

It is an amenable number.

6561005101 is a deficient number, since it is larger than the sum of its proper divisors (937286451).

6561005101 is an equidigital number, since it uses as much as digits as its factorization.

6561005101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937286450.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 6561005101 is about 81000.0314876482. The cubic root of 6561005101 is about 1872.0759259093.

Adding to 6561005101 its reverse (1015001656), we get a palindrome (7576006757).

The spelling of 6561005101 in words is "six billion, five hundred sixty-one million, five thousand, one hundred one".