166543834 has 4 divisors (see below), whose sum is σ = 249815754. Its totient is φ = 83271916.

The previous prime is 166543801. The next prime is 166543877. The reversal of 166543834 is 438345661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 162945225 + 3598609 = 12765^2 + 1897^2 .

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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41635957 + ... + 41635960.

Almost surely, 2^166543834 is an apocalyptic number.

166543834 is a deficient number, since it is larger than the sum of its proper divisors (83271920).

166543834 is an equidigital number, since it uses as much as digits as its factorization.

166543834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83271919.

The product of its digits is 207360, while the sum is 40.

The square root of 166543834 is about 12905.1863217855. The cubic root of 166543834 is about 550.1859800798.

The spelling of 166543834 in words is "one hundred sixty-six million, five hundred forty-three thousand, eight hundred thirty-four".