166216126 has 4 divisors (see below), whose sum is σ = 249324192. Its totient is φ = 83108062.

The previous prime is 166216117. The next prime is 166216129. The reversal of 166216126 is 621612661.

166216126 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.

It is a Smith number, since the sum of its digits (31) 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 (166216129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41554030 + ... + 41554033.

It is an arithmetic number, because the mean of its divisors is an integer number (62331048).

Almost surely, 2^166216126 is an apocalyptic number.

166216126 is a deficient number, since it is larger than the sum of its proper divisors (83108066).

166216126 is an equidigital number, since it uses as much as digits as its factorization.

166216126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83108065.

The product of its digits is 5184, while the sum is 31.

The square root of 166216126 is about 12892.4833139314. The cubic root of 166216126 is about 549.8248764769.

Adding to 166216126 its reverse (621612661), we get a palindrome (787828787).

The spelling of 166216126 in words is "one hundred sixty-six million, two hundred sixteen thousand, one hundred twenty-six".