168111638 has 4 divisors (see below), whose sum is σ = 252167460. Its totient is φ = 84055818.

The previous prime is 168111617. The next prime is 168111641. The reversal of 168111638 is 836111861.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 168111598 and 168111607.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 42027908 + ... + 42027911.

It is an arithmetic number, because the mean of its divisors is an integer number (63041865).

Almost surely, 2^168111638 is an apocalyptic number.

168111638 is a deficient number, since it is larger than the sum of its proper divisors (84055822).

168111638 is an equidigital number, since it uses as much as digits as its factorization.

168111638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84055821.

The product of its digits is 6912, while the sum is 35.

The square root of 168111638 is about 12965.7872109641. The cubic root of 168111638 is about 551.9070307441.

The spelling of 168111638 in words is "one hundred sixty-eight million, one hundred eleven thousand, six hundred thirty-eight".