168138550 has 24 divisors (see below), whose sum is σ = 313111656. Its totient is φ = 67175040.

The previous prime is 168138547. The next prime is 168138563. The reversal of 168138550 is 55831861.

168138550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×168138550² = 56541143992205000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 57934 + ... + 60766.

It is an arithmetic number, because the mean of its divisors is an integer number (13046319).

Almost surely, 2^168138550 is an apocalyptic number.

168138550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168138550 is a deficient number, since it is larger than the sum of its proper divisors (144973106).

168138550 is a wasteful number, since it uses less digits than its factorization.

168138550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032 (or 4027 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 168138550 is about 12966.8249776111. The cubic root of 168138550 is about 551.9364796858.

The spelling of 168138550 in words is "one hundred sixty-eight million, one hundred thirty-eight thousand, five hundred fifty".