166891470 has 16 divisors (see below), whose sum is σ = 400539600. Its totient is φ = 44504384.

The previous prime is 166891469. The next prime is 166891477. The reversal of 166891470 is 74198661.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166891477) 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 7 ways as a sum of consecutive naturals, for example, 2781495 + ... + 2781554.

It is an arithmetic number, because the mean of its divisors is an integer number (25033725).

Almost surely, 2^166891470 is an apocalyptic number.

166891470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166891470 is an abundant number, since it is smaller than the sum of its proper divisors (233648130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166891470 is a wasteful number, since it uses less digits than its factorization.

166891470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5563059.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 166891470 is about 12918.6481490905. The cubic root of 166891470 is about 550.5685250711.

The spelling of 166891470 in words is "one hundred sixty-six million, eight hundred ninety-one thousand, four hundred seventy".