6561606010565 has 8 divisors (see below), whose sum is σ = 7878534553080. Its totient is φ = 5246213248192.

The previous prime is 6561606010541. The next prime is 6561606010577. The reversal of 6561606010565 is 5650106061656.

It can be written as a sum of positive squares in 4 ways, for example, as 317914417921 + 6243691592644 = 563839^2 + 2498738^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6561606010565 - 2⁶ = 6561606010501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383935634 + ... + 383952723.

It is an arithmetic number, because the mean of its divisors is an integer number (984816819135).

Almost surely, 2^{6561606010565} is an apocalyptic number.

It is an amenable number.

6561606010565 is a deficient number, since it is larger than the sum of its proper divisors (1316928542515).

6561606010565 is a wasteful number, since it uses less digits than its factorization.

6561606010565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767890071.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 6561606010565 in words is "six trillion, five hundred sixty-one billion, six hundred six million, ten thousand, five hundred sixty-five".