166493977 has 4 divisors (see below), whose sum is σ = 179301220. Its totient is φ = 153686736.

The previous prime is 166493939. The next prime is 166494037. The reversal of 166493977 is 779394661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9217296 + 157276681 = 3036^2 + 12541^2 .

It is a cyclic number.

It is not a de Polignac number, because 166493977 - 2²³ = 158105369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166493077) 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 in 3 ways as a sum of consecutive naturals, for example, 6403602 + ... + 6403627.

It is an arithmetic number, because the mean of its divisors is an integer number (44825305).

Almost surely, 2^166493977 is an apocalyptic number.

It is an amenable number.

166493977 is a deficient number, since it is larger than the sum of its proper divisors (12807243).

166493977 is a wasteful number, since it uses less digits than its factorization.

166493977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12807242.

The product of its digits is 1714608, while the sum is 52.

The square root of 166493977 is about 12903.2545119439. The cubic root of 166493977 is about 550.1310728932.

The spelling of 166493977 in words is "one hundred sixty-six million, four hundred ninety-three thousand, nine hundred seventy-seven".