166501323164441 has 4 divisors (see below), whose sum is σ = 166505572746084. Its totient is φ = 166497073582800.

The previous prime is 166501323164413. The next prime is 166501323164453. The reversal of 166501323164441 is 144461323105661.

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 127849040491225 + 38652282673216 = 11307035^2 + 6217096^2 .

It is a cyclic number.

It is not a de Polignac number, because 166501323164441 - 2²² = 166501318970137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166501323164461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2124732050 + ... + 2124810411.

It is an arithmetic number, because the mean of its divisors is an integer number (41626393186521).

Almost surely, 2^{166501323164441} is an apocalyptic number.

It is an amenable number.

166501323164441 is a deficient number, since it is larger than the sum of its proper divisors (4249581643).

166501323164441 is an equidigital number, since it uses as much as digits as its factorization.

166501323164441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249581642.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 166501323164441 in words is "one hundred sixty-six trillion, five hundred one billion, three hundred twenty-three million, one hundred sixty-four thousand, four hundred forty-one".