5665515016561 has 4 divisors (see below), whose sum is σ = 5733774233712. Its totient is φ = 5597255799412.

The previous prime is 5665515016541. The next prime is 5665515016589. The reversal of 5665515016561 is 1656105155665.

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 not a de Polignac number, because 5665515016561 - 2⁵ = 5665515016529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5665515016499 and 5665515016508.

It is not an unprimeable number, because it can be changed into a prime (5665515016541) 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, 34129608451 + ... + 34129608616.

It is an arithmetic number, because the mean of its divisors is an integer number (1433443558428).

Almost surely, 2^{5665515016561} is an apocalyptic number.

It is an amenable number.

5665515016561 is a deficient number, since it is larger than the sum of its proper divisors (68259217151).

5665515016561 is an equidigital number, since it uses as much as digits as its factorization.

5665515016561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68259217150.

The product of its (nonzero) digits is 4050000, while the sum is 52.

The spelling of 5665515016561 in words is "five trillion, six hundred sixty-five billion, five hundred fifteen million, sixteen thousand, five hundred sixty-one".