5665511500081 has 4 divisors (see below), whose sum is σ = 5673880055412. Its totient is φ = 5657142944752.

The previous prime is 5665511500073. The next prime is 5665511500087. The reversal of 5665511500081 is 1800051155665.

It is a happy number.

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 5169184205056 + 496327295025 = 2273584^2 + 704505^2 .

It is a cyclic number.

It is not a de Polignac number, because 5665511500081 - 2³ = 5665511500073 is a prime.

It is a super-2 number, since 2×5665511500081² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5665511500087) 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, 4184276650 + ... + 4184278003.

It is an arithmetic number, because the mean of its divisors is an integer number (1418470013853).

Almost surely, 2^{5665511500081} is an apocalyptic number.

It is an amenable number.

5665511500081 is a deficient number, since it is larger than the sum of its proper divisors (8368555331).

5665511500081 is an equidigital number, since it uses as much as digits as its factorization.

5665511500081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8368555330.

The product of its (nonzero) digits is 180000, while the sum is 43.

The spelling of 5665511500081 in words is "five trillion, six hundred sixty-five billion, five hundred eleven million, five hundred thousand, eighty-one".