81166327 has 16 divisors (see below), whose sum is σ = 91555200. Its totient is φ = 71316000.

The previous prime is 81166307. The next prime is 81166357. The reversal of 81166327 is 72366118.

It is a cyclic number.

It is not a de Polignac number, because 81166327 - 2⁷ = 81166199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81166292 and 81166301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81166307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46924 + ... + 48622.

It is an arithmetic number, because the mean of its divisors is an integer number (5722200).

Almost surely, 2^81166327 is an apocalyptic number.

81166327 is a deficient number, since it is larger than the sum of its proper divisors (10388873).

81166327 is a wasteful number, since it uses less digits than its factorization.

81166327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854.

The product of its digits is 12096, while the sum is 34.

The square root of 81166327 is about 9009.2356501537. The cubic root of 81166327 is about 432.9708229891.

The spelling of 81166327 in words is "eighty-one million, one hundred sixty-six thousand, three hundred twenty-seven".