18170944856081 has 2 divisors, whose sum is σ = 18170944856082. Its totient is φ = 18170944856080.

The previous prime is 18170944856069. The next prime is 18170944856087. The reversal of 18170944856081 is 18065844907181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17353548046081 + 817396810000 = 4165759^2 + 904100^2 .

It is a cyclic number.

It is not a de Polignac number, because 18170944856081 - 2⁶ = 18170944856017 is a prime.

It is a super-2 number, since 2×18170944856081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18170944856087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9085472428040 + 9085472428041.

It is an arithmetic number, because the mean of its divisors is an integer number (9085472428041).

Almost surely, 2^{18170944856081} is an apocalyptic number.

It is an amenable number.

18170944856081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18170944856081 is an equidigital number, since it uses as much as digits as its factorization.

18170944856081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15482880, while the sum is 62.

The spelling of 18170944856081 in words is "eighteen trillion, one hundred seventy billion, nine hundred forty-four million, eight hundred fifty-six thousand, eighty-one".