18170944856065 has 8 divisors (see below), whose sum is σ = 21805464159720. Its totient is φ = 14536535663232.

The previous prime is 18170944856023. The next prime is 18170944856069. The reversal of 18170944856065 is 56065844907181.

It can be written as a sum of positive squares in 4 ways, for example, as 544751753329 + 17626193102736 = 738073^2 + 4198356^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18170944856065 - 2²⁵ = 18170911301633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18170944855988 and 18170944856006.

It is not an unprimeable number, because it can be changed into a prime (18170944856069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27164214 + ... + 27825103.

It is an arithmetic number, because the mean of its divisors is an integer number (2725683019965).

Almost surely, 2^{18170944856065} is an apocalyptic number.

It is an amenable number.

18170944856065 is a deficient number, since it is larger than the sum of its proper divisors (3634519303655).

18170944856065 is an equidigital number, since it uses as much as digits as its factorization.

18170944856065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55055411.

The product of its (nonzero) digits is 58060800, while the sum is 64.

The spelling of 18170944856065 in words is "eighteen trillion, one hundred seventy billion, nine hundred forty-four million, eight hundred fifty-six thousand, sixty-five".