166320149 has 4 divisors (see below), whose sum is σ = 170376780. Its totient is φ = 162263520.

The previous prime is 166320113. The next prime is 166320179. The reversal of 166320149 is 941023661.

166320149 is nontrivially palindromic in base 15.

166320149 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: 941023661 = 17 ⋅55354333.

It can be written as a sum of positive squares in 2 ways, for example, as 64915249 + 101404900 = 8057^2 + 10070^2 .

It is a cyclic number.

It is not a de Polignac number, because 166320149 - 2⁸ = 166319893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166320109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2028254 + ... + 2028335.

It is an arithmetic number, because the mean of its divisors is an integer number (42594195).

Almost surely, 2^166320149 is an apocalyptic number.

It is an amenable number.

166320149 is a deficient number, since it is larger than the sum of its proper divisors (4056631).

166320149 is an equidigital number, since it uses as much as digits as its factorization.

166320149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056630.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 166320149 is about 12896.5169328777. The cubic root of 166320149 is about 549.9395514833.

It can be divided in two parts, 1663 and 20149, that added together give a palindrome (21812).

The spelling of 166320149 in words is "one hundred sixty-six million, three hundred twenty thousand, one hundred forty-nine".