9918166 has 4 divisors (see below), whose sum is σ = 14877252. Its totient is φ = 4959082.

The previous prime is 9918163. The next prime is 9918169. The reversal of 9918166 is 6618199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6618199 = 7 ⋅945457.

It is an interprime number because it is at equal distance from previous prime (9918163) and next prime (9918169).

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

9918166 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9918163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2479540 + ... + 2479543.

It is an arithmetic number, because the mean of its divisors is an integer number (3719313).

Almost surely, 2^9918166 is an apocalyptic number.

9918166 is a deficient number, since it is larger than the sum of its proper divisors (4959086).

9918166 is a wasteful number, since it uses less digits than its factorization.

9918166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4959085.

The product of its digits is 23328, while the sum is 40.

The square root of 9918166 is about 3149.3119883556. The cubic root of 9918166 is about 214.8541718885.

The spelling of 9918166 in words is "nine million, nine hundred eighteen thousand, one hundred sixty-six".