166401193 has 4 divisors (see below), whose sum is σ = 190172800. Its totient is φ = 142629588.

The previous prime is 166401187. The next prime is 166401199. The reversal of 166401193 is 391104661.

166401193 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 an interprime number because it is at equal distance from previous prime (166401187) and next prime (166401199).

It is a cyclic number.

It is not a de Polignac number, because 166401193 - 2⁵ = 166401161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166401199) 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, 11885793 + ... + 11885806.

It is an arithmetic number, because the mean of its divisors is an integer number (47543200).

Almost surely, 2^166401193 is an apocalyptic number.

It is an amenable number.

166401193 is a deficient number, since it is larger than the sum of its proper divisors (23771607).

166401193 is an equidigital number, since it uses as much as digits as its factorization.

166401193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23771606.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 166401193 is about 12899.6586388943. The cubic root of 166401193 is about 550.0288612954.

The spelling of 166401193 in words is "one hundred sixty-six million, four hundred one thousand, one hundred ninety-three".