81066018 has 16 divisors (see below), whose sum is σ = 176871456. Its totient is φ = 24565440.

The previous prime is 81065993. The next prime is 81066019.

81066018 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (81066019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 614071 + ... + 614202.

It is an arithmetic number, because the mean of its divisors is an integer number (11054466).

Almost surely, 2^81066018 is an apocalyptic number.

81066018 is an abundant number, since it is smaller than the sum of its proper divisors (95805438).

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

81066018 is a wasteful number, since it uses less digits than its factorization.

81066018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228289.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 81066018 is about 9003.6669196500. Note that the first 3 decimals coincide. The cubic root of 81066018 is about 432.7923878528.

The spelling of 81066018 in words is "eighty-one million, sixty-six thousand, eighteen".