166465334454401 has 2 divisors, whose sum is σ = 166465334454402. Its totient is φ = 166465334454400.

The previous prime is 166465334454373. The next prime is 166465334454413. The reversal of 166465334454401 is 104454433564661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143857211414401 + 22608123040000 = 11994049^2 + 4754800^2 .

It is a cyclic number.

It is not a de Polignac number, because 166465334454401 - 2¹⁸ = 166465334192257 is a prime.

It is not a weakly prime, because it can be changed into another prime (166465334454451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83232667227200 + 83232667227201.

It is an arithmetic number, because the mean of its divisors is an integer number (83232667227201).

Almost surely, 2^{166465334454401} is an apocalyptic number.

It is an amenable number.

166465334454401 is a deficient number, since it is larger than the sum of its proper divisors (1).

166465334454401 is an equidigital number, since it uses as much as digits as its factorization.

166465334454401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49766400, while the sum is 56.

The spelling of 166465334454401 in words is "one hundred sixty-six trillion, four hundred sixty-five billion, three hundred thirty-four million, four hundred fifty-four thousand, four hundred one".