166446642416641 has 8 divisors (see below), whose sum is σ = 166707134089664. Its totient is φ = 166186155813840.

The previous prime is 166446642416627. The next prime is 166446642416699. The reversal of 166446642416641 is 146614246644661.

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 166446642416641 - 2³⁵ = 166412282678273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166446642416641.

It is not an unprimeable number, because it can be changed into a prime (166446642413641) 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 in 7 ways as a sum of consecutive naturals, for example, 67343380 + ... + 69771226.

It is an arithmetic number, because the mean of its divisors is an integer number (20838391761208).

Almost surely, 2^{166446642416641} is an apocalyptic number.

It is an amenable number.

166446642416641 is a deficient number, since it is larger than the sum of its proper divisors (260491673023).

166446642416641 is a wasteful number, since it uses less digits than its factorization.

166446642416641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535111.

The product of its digits is 95551488, while the sum is 61.

The spelling of 166446642416641 in words is "one hundred sixty-six trillion, four hundred forty-six billion, six hundred forty-two million, four hundred sixteen thousand, six hundred forty-one".