166032020045321 has 2 divisors, whose sum is σ = 166032020045322. Its totient is φ = 166032020045320.

The previous prime is 166032020045231. The next prime is 166032020045351. The reversal of 166032020045321 is 123540020230661.

Together with previous prime (166032020045231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112952577247225 + 53079442798096 = 10627915^2 + 7285564^2 .

It is a cyclic number.

It is not a de Polignac number, because 166032020045321 - 2¹⁸ = 166032019783177 is a prime.

It is not a weakly prime, because it can be changed into another prime (166032020045351) 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 as a sum of consecutive naturals, namely, 83016010022660 + 83016010022661.

It is an arithmetic number, because the mean of its divisors is an integer number (83016010022661).

Almost surely, 2^{166032020045321} is an apocalyptic number.

It is an amenable number.

166032020045321 is a deficient number, since it is larger than the sum of its proper divisors (1).

166032020045321 is an equidigital number, since it uses as much as digits as its factorization.

166032020045321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 166032020045321 its reverse (123540020230661), we get a palindrome (289572040275982).

The spelling of 166032020045321 in words is "one hundred sixty-six trillion, thirty-two billion, twenty million, forty-five thousand, three hundred twenty-one".