166849394 has 4 divisors (see below), whose sum is σ = 250274094. Its totient is φ = 83424696.

The previous prime is 166849381. The next prime is 166849399. The reversal of 166849394 is 493948661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493948661 = 11969 ⋅41269.

It can be written as a sum of positive squares in only one way, i.e., 159693769 + 7155625 = 12637^2 + 2675^2 .

It is not an unprimeable number, because it can be changed into a prime (166849399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41712347 + ... + 41712350.

Almost surely, 2^166849394 is an apocalyptic number.

166849394 is a deficient number, since it is larger than the sum of its proper divisors (83424700).

166849394 is an equidigital number, since it uses as much as digits as its factorization.

166849394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83424699.

The product of its digits is 1119744, while the sum is 50.

The square root of 166849394 is about 12917.0195478678. The cubic root of 166849394 is about 550.5222521482.

The spelling of 166849394 in words is "one hundred sixty-six million, eight hundred forty-nine thousand, three hundred ninety-four".