81594166 has 8 divisors (see below), whose sum is σ = 122431320. Its totient is φ = 40783728.

The previous prime is 81594143. The next prime is 81594173. The reversal of 81594166 is 66149518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5145 + ... + 13771.

It is an arithmetic number, because the mean of its divisors is an integer number (15303915).

Almost surely, 2^81594166 is an apocalyptic number.

81594166 is a deficient number, since it is larger than the sum of its proper divisors (40837154).

81594166 is a wasteful number, since it uses less digits than its factorization.

81594166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13358.

The product of its digits is 51840, while the sum is 40.

The square root of 81594166 is about 9032.9489094094. The cubic root of 81594166 is about 433.7302400287.

The spelling of 81594166 in words is "eighty-one million, five hundred ninety-four thousand, one hundred sixty-six".