166493905 has 16 divisors (see below), whose sum is σ = 202011264. Its totient is φ = 131725440.

The previous prime is 166493891. The next prime is 166493909. The reversal of 166493905 is 509394661.

It is not a de Polignac number, because 166493905 - 2²¹ = 164396753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166493909) 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, 228652 + ... + 229378.

It is an arithmetic number, because the mean of its divisors is an integer number (12625704).

Almost surely, 2^166493905 is an apocalyptic number.

It is an amenable number.

166493905 is a deficient number, since it is larger than the sum of its proper divisors (35517359).

166493905 is a wasteful number, since it uses less digits than its factorization.

166493905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 166493905 is about 12903.2517219498. The cubic root of 166493905 is about 550.1309935921.

The spelling of 166493905 in words is "one hundred sixty-six million, four hundred ninety-three thousand, nine hundred five".