166816544401 has 4 divisors (see below), whose sum is σ = 179648586292. Its totient is φ = 153984502512.

The previous prime is 166816544393. The next prime is 166816544407. The reversal of 166816544401 is 104445618661.

166816544401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46268010000 + 120548534401 = 215100^2 + 347201^2 .

It is a cyclic number.

It is not a de Polignac number, because 166816544401 - 2³ = 166816544393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166816544407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6416020926 + ... + 6416020951.

It is an arithmetic number, because the mean of its divisors is an integer number (44912146573).

Almost surely, 2^166816544401 is an apocalyptic number.

It is an amenable number.

166816544401 is a deficient number, since it is larger than the sum of its proper divisors (12832041891).

166816544401 is a wasteful number, since it uses less digits than its factorization.

166816544401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12832041890.

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 166816544401 in words is "one hundred sixty-six billion, eight hundred sixteen million, five hundred forty-four thousand, four hundred one".