5656518815665 has 16 divisors (see below), whose sum is σ = 6792587189712. Its totient is φ = 4522039087104.

The previous prime is 5656518815641. The next prime is 5656518815699. The reversal of 5656518815665 is 5665188156565.

It can be written as a sum of positive squares in 8 ways, for example, as 2124551117056 + 3531967698609 = 1457584^2 + 1879353^2 .

It is a cyclic number.

It is not a de Polignac number, because 5656518815665 - 2⁷ = 5656518815537 is a prime.

It is a super-2 number, since 2×5656518815665² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5656518815665.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187927897 + ... + 187957993.

It is an arithmetic number, because the mean of its divisors is an integer number (424536699357).

Almost surely, 2^{5656518815665} is an apocalyptic number.

It is an amenable number.

5656518815665 is a deficient number, since it is larger than the sum of its proper divisors (1136068374047).

5656518815665 is a wasteful number, since it uses less digits than its factorization.

5656518815665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55236.

The product of its digits is 259200000, while the sum is 67.

The spelling of 5656518815665 in words is "five trillion, six hundred fifty-six billion, five hundred eighteen million, eight hundred fifteen thousand, six hundred sixty-five".