81100168 has 16 divisors (see below), whose sum is σ = 153262080. Its totient is φ = 40230288.

The previous prime is 81100163. The next prime is 81100181. The reversal of 81100168 is 86100118.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81100163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38896 + ... + 40927.

It is an arithmetic number, because the mean of its divisors is an integer number (9578880).

Almost surely, 2^81100168 is an apocalyptic number.

It is an amenable number.

81100168 is a deficient number, since it is larger than the sum of its proper divisors (72161912).

81100168 is a wasteful number, since it uses less digits than its factorization.

81100168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79956 (or 79952 counting only the distinct ones).

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

The square root of 81100168 is about 9005.5631695081. The cubic root of 81100168 is about 432.8531522582.

The spelling of 81100168 in words is "eighty-one million, one hundred thousand, one hundred sixty-eight".