81166104 has 48 divisors (see below), whose sum is σ = 225829800. Its totient is φ = 27011232.

The previous prime is 81166093. The next prime is 81166117. The reversal of 81166104 is 40166118.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132102 + ... + 132714.

Almost surely, 2^81166104 is an apocalyptic number.

It is an amenable number.

81166104 is an abundant number, since it is smaller than the sum of its proper divisors (144663696).

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

81166104 is an equidigital number, since it uses as much as digits as its factorization.

81166104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81166104 is about 9009.2232739565. The cubic root of 81166104 is about 432.9704264676.

The spelling of 81166104 in words is "eighty-one million, one hundred sixty-six thousand, one hundred four".