81166110 has 16 divisors (see below), whose sum is σ = 194798736. Its totient is φ = 21644288.

The previous prime is 81166093. The next prime is 81166117. The reversal of 81166110 is 1166118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81166117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1352739 + ... + 1352798.

It is an arithmetic number, because the mean of its divisors is an integer number (12174921).

Almost surely, 2^81166110 is an apocalyptic number.

81166110 is an abundant number, since it is smaller than the sum of its proper divisors (113632626).

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

81166110 is a wasteful number, since it uses less digits than its factorization.

81166110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2705547.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 81166110 is about 9009.2236069486. The cubic root of 81166110 is about 432.9704371363.

The spelling of 81166110 in words is "eighty-one million, one hundred sixty-six thousand, one hundred ten".