6535665316561 has 8 divisors (see below), whose sum is σ = 6675455706624. Its totient is φ = 6395905496640.

The previous prime is 6535665316519. The next prime is 6535665316633. The reversal of 6535665316561 is 1656135665356.

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 6535665316561 - 2¹¹ = 6535665314513 is a prime.

It is a super-2 number, since 2×6535665316561² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6535665316496 and 6535665316505.

It is not an unprimeable number, because it can be changed into a prime (6535665316861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7210120 + ... + 8065801.

It is an arithmetic number, because the mean of its divisors is an integer number (834431963328).

Almost surely, 2^{6535665316561} is an apocalyptic number.

It is an amenable number.

6535665316561 is a deficient number, since it is larger than the sum of its proper divisors (139790390063).

6535665316561 is a wasteful number, since it uses less digits than its factorization.

6535665316561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15285071.

The product of its digits is 43740000, while the sum is 58.

The spelling of 6535665316561 in words is "six trillion, five hundred thirty-five billion, six hundred sixty-five million, three hundred sixteen thousand, five hundred sixty-one".