168018100 has 18 divisors (see below), whose sum is σ = 364599494. Its totient is φ = 67207200.

The previous prime is 168018043. The next prime is 168018101. The reversal of 168018100 is 1810861.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 16875664 + 151142436 = 4108^2 + 12294^2 .

It is a super-2 number, since 2×168018100² = 56460163855220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168018101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 839991 + ... + 840190.

Almost surely, 2^168018100 is an apocalyptic number.

168018100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168018100 is an abundant number, since it is smaller than the sum of its proper divisors (196581394).

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

168018100 is a wasteful number, since it uses less digits than its factorization.

168018100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680195 (or 1680188 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 168018100 is about 12962.1796006690. The cubic root of 168018100 is about 551.8046506470.

Adding to 168018100 its reverse (1810861), we get a palindrome (169828961).

The spelling of 168018100 in words is "one hundred sixty-eight million, eighteen thousand, one hundred".