166216634 has 4 divisors (see below), whose sum is σ = 249324954. Its totient is φ = 83108316.

The previous prime is 166216627. The next prime is 166216651. The reversal of 166216634 is 436612661.

166216634 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 an emirpimes, since its reverse is a distinct semiprime: 436612661 = 29 ⋅15055609.

It can be written as a sum of positive squares in only one way, i.e., 156625225 + 9591409 = 12515^2 + 3097^2 .

It is a junction number, because it is equal to n+sod(n) for n = 166216594 and 166216603.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41554157 + ... + 41554160.

Almost surely, 2^166216634 is an apocalyptic number.

166216634 is a deficient number, since it is larger than the sum of its proper divisors (83108320).

166216634 is an equidigital number, since it uses as much as digits as its factorization.

166216634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83108319.

The product of its digits is 31104, while the sum is 35.

The square root of 166216634 is about 12892.5030153186. The cubic root of 166216634 is about 549.8254366126.

The spelling of 166216634 in words is "one hundred sixty-six million, two hundred sixteen thousand, six hundred thirty-four".