8223564661555 has 16 divisors (see below), whose sum is σ = 10247606820864. Its totient is φ = 6328507148640.

The previous prime is 8223564661549. The next prime is 8223564661567. The reversal of 8223564661555 is 5551664653228.

It is not a de Polignac number, because 8223564661555 - 2⁵ = 8223564661523 is a prime.

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 8223564661555.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 158822187 + ... + 158873956.

It is an arithmetic number, because the mean of its divisors is an integer number (640475426304).

Almost surely, 2^{8223564661555} is an apocalyptic number.

8223564661555 is a deficient number, since it is larger than the sum of its proper divisors (2024042159309).

8223564661555 is a wasteful number, since it uses less digits than its factorization.

8223564661555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317696346.

The product of its digits is 51840000, while the sum is 58.

The spelling of 8223564661555 in words is "eight trillion, two hundred twenty-three billion, five hundred sixty-four million, six hundred sixty-one thousand, five hundred fifty-five".