166318193 has 4 divisors (see below), whose sum is σ = 171683328. Its totient is φ = 160953060.

The previous prime is 166318189. The next prime is 166318211. The reversal of 166318193 is 391813661.

166318193 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, and also an emirpimes, since its reverse is a distinct semiprime: 391813661 = 311 ⋅1259851.

It is a cyclic number.

It is not a de Polignac number, because 166318193 - 2² = 166318189 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166318183) 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, 2682521 + ... + 2682582.

It is an arithmetic number, because the mean of its divisors is an integer number (42920832).

Almost surely, 2^166318193 is an apocalyptic number.

It is an amenable number.

166318193 is a deficient number, since it is larger than the sum of its proper divisors (5365135).

166318193 is an equidigital number, since it uses as much as digits as its factorization.

166318193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365134.

The product of its digits is 23328, while the sum is 38.

The square root of 166318193 is about 12896.4410982255. The cubic root of 166318193 is about 549.9373956291.

The spelling of 166318193 in words is "one hundred sixty-six million, three hundred eighteen thousand, one hundred ninety-three".