166536166 has 4 divisors (see below), whose sum is σ = 249804252. Its totient is φ = 83268082.

The previous prime is 166536163. The next prime is 166536193. The reversal of 166536166 is 661635661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661635661 = 1489 ⋅444349.

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.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166536163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41634040 + ... + 41634043.

It is an arithmetic number, because the mean of its divisors is an integer number (62451063).

Almost surely, 2^166536166 is an apocalyptic number.

166536166 is a deficient number, since it is larger than the sum of its proper divisors (83268086).

166536166 is an equidigital number, since it uses as much as digits as its factorization.

166536166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83268085.

The product of its digits is 116640, while the sum is 40.

The square root of 166536166 is about 12904.8892285056. The cubic root of 166536166 is about 550.1775360749.

The spelling of 166536166 in words is "one hundred sixty-six million, five hundred thirty-six thousand, one hundred sixty-six".