168638233 has 4 divisors (see below), whose sum is σ = 174078208. Its totient is φ = 163198260.

The previous prime is 168638213. The next prime is 168638257. The reversal of 168638233 is 332836861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 168638233 - 2¹⁷ = 168507161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168638203) 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 3 ways as a sum of consecutive naturals, for example, 2719941 + ... + 2720002.

It is an arithmetic number, because the mean of its divisors is an integer number (43519552).

Almost surely, 2^168638233 is an apocalyptic number.

It is an amenable number.

168638233 is a deficient number, since it is larger than the sum of its proper divisors (5439975).

168638233 is an equidigital number, since it uses as much as digits as its factorization.

168638233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5439974.

The product of its digits is 124416, while the sum is 40.

The square root of 168638233 is about 12986.0784303807. The cubic root of 168638233 is about 552.4826969186.

It can be divided in two parts, 168 and 638233, that added together give a square (638401 = 799²).

The spelling of 168638233 in words is "one hundred sixty-eight million, six hundred thirty-eight thousand, two hundred thirty-three".