168921255 has 16 divisors (see below), whose sum is σ = 270436320. Its totient is φ = 90037248.

The previous prime is 168921253. The next prime is 168921281. The reversal of 168921255 is 552129861.

It is not a de Polignac number, because 168921255 - 2¹ = 168921253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168921251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42639 + ... + 46431.

It is an arithmetic number, because the mean of its divisors is an integer number (16902270).

Almost surely, 2^168921255 is an apocalyptic number.

168921255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

168921255 is a deficient number, since it is larger than the sum of its proper divisors (101515065).

168921255 is a wasteful number, since it uses less digits than its factorization.

168921255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770.

The product of its digits is 43200, while the sum is 39.

The square root of 168921255 is about 12996.9709932738. The cubic root of 168921255 is about 552.7915975397.

The spelling of 168921255 in words is "one hundred sixty-eight million, nine hundred twenty-one thousand, two hundred fifty-five".