166991808 has 56 divisors (see below), whose sum is σ = 442943488. Its totient is φ = 55524096.

The previous prime is 166991801. The next prime is 166991809. The reversal of 166991808 is 808199661.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166991801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99585 + ... + 101247.

Almost surely, 2^166991808 is an apocalyptic number.

It is an amenable number.

166991808 is an abundant number, since it is smaller than the sum of its proper divisors (275951680).

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

166991808 is a wasteful number, since it uses less digits than its factorization.

166991808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201 (or 2191 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 166991808 is about 12922.5310214369. The cubic root of 166991808 is about 550.6788400308.

The spelling of 166991808 in words is "one hundred sixty-six million, nine hundred ninety-one thousand, eight hundred eight".