81466 has 24 divisors (see below), whose sum is σ = 159264. Its totient is φ = 30360.

The previous prime is 81463. The next prime is 81509. The reversal of 81466 is 66418.

81466 = 81² + 82² + ... + 91².

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 81466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3531 + ... + 3553.

It is an arithmetic number, because the mean of its divisors is an integer number (6636).

2⁸¹⁴⁶⁶ is an apocalyptic number.

81466 is a deficient number, since it is larger than the sum of its proper divisors (77798).

81466 is a wasteful number, since it uses less digits than its factorization.

81466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 43 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 81466 is about 285.4224938578. The cubic root of 81466 is about 43.3503023614.

The spelling of 81466 in words is "eighty-one thousand, four hundred sixty-six".