5665565660651 has 4 divisors (see below), whose sum is σ = 6101378403792. Its totient is φ = 5229752917512.

The previous prime is 5665565660603. The next prime is 5665565660663. The reversal of 5665565660651 is 1560665655665.

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

It is a cyclic number.

It is not a de Polignac number, because 5665565660651 - 2³⁴ = 5648385791467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5665565660851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217906371551 + ... + 217906371576.

It is an arithmetic number, because the mean of its divisors is an integer number (1525344600948).

Almost surely, 2^{5665565660651} is an apocalyptic number.

5665565660651 is a deficient number, since it is larger than the sum of its proper divisors (435812743141).

5665565660651 is a wasteful number, since it uses less digits than its factorization.

5665565660651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435812743140.

The product of its (nonzero) digits is 145800000, while the sum is 62.

The spelling of 5665565660651 in words is "five trillion, six hundred sixty-five billion, five hundred sixty-five million, six hundred sixty thousand, six hundred fifty-one".