6561055010101 has 4 divisors (see below), whose sum is σ = 6561594715852. Its totient is φ = 6560515304352.

The previous prime is 6561055010087. The next prime is 6561055010129. The reversal of 6561055010101 is 1010105501656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 498084474001 + 6062970536100 = 705751^2 + 2462310^2 .

It is a cyclic number.

It is not a de Polignac number, because 6561055010101 - 2³⁹ = 6011299196213 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 (6561055010131) 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, 269834640 + ... + 269858953.

It is an arithmetic number, because the mean of its divisors is an integer number (1640398678963).

Almost surely, 2^{6561055010101} is an apocalyptic number.

It is an amenable number.

6561055010101 is a deficient number, since it is larger than the sum of its proper divisors (539705751).

6561055010101 is a wasteful number, since it uses less digits than its factorization.

6561055010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539705750.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 6561055010101 in words is "six trillion, five hundred sixty-one billion, fifty-five million, ten thousand, one hundred one".