166166005611161 has 4 divisors (see below), whose sum is σ = 166166056558800. Its totient is φ = 166165954663524.

The previous prime is 166166005611149. The next prime is 166166005611163. The reversal of 166166005611161 is 161116500661661.

166166005611161 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166166005611161 - 2⁴² = 161767959100057 is a prime.

It is a super-2 number, since 2×166166005611161² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166166005611163) 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, 20220431 + ... + 27224948.

It is an arithmetic number, because the mean of its divisors is an integer number (41541514139700).

Almost surely, 2^{166166005611161} is an apocalyptic number.

It is an amenable number.

166166005611161 is a deficient number, since it is larger than the sum of its proper divisors (50947639).

166166005611161 is an equidigital number, since it uses as much as digits as its factorization.

166166005611161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50947638.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 166166005611161 in words is "one hundred sixty-six trillion, one hundred sixty-six billion, five million, six hundred eleven thousand, one hundred sixty-one".