166491958 has 32 divisors (see below), whose sum is σ = 266412960. Its totient is φ = 77898240.

The previous prime is 166491953. The next prime is 166491967. The reversal of 166491958 is 859194661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166491953) 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 15 ways as a sum of consecutive naturals, for example, 600916 + ... + 601192.

It is an arithmetic number, because the mean of its divisors is an integer number (8325405).

Almost surely, 2^166491958 is an apocalyptic number.

166491958 is a deficient number, since it is larger than the sum of its proper divisors (99921002).

166491958 is a wasteful number, since it uses less digits than its factorization.

166491958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592.

The product of its digits is 466560, while the sum is 49.

The square root of 166491958 is about 12903.1762756307. The cubic root of 166491958 is about 550.1288491508.

The spelling of 166491958 in words is "one hundred sixty-six million, four hundred ninety-one thousand, nine hundred fifty-eight".