81466705 has 4 divisors (see below), whose sum is σ = 97760052. Its totient is φ = 65173360.

The previous prime is 81466691. The next prime is 81466727. The reversal of 81466705 is 50766418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50766418 = 2 ⋅25383209.

It can be written as a sum of positive squares in 2 ways, for example, as 61324561 + 20142144 = 7831^2 + 4488^2 .

It is not a de Polignac number, because 81466705 - 2⁷ = 81466577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8146666 + ... + 8146675.

It is an arithmetic number, because the mean of its divisors is an integer number (24440013).

Almost surely, 2^81466705 is an apocalyptic number.

It is an amenable number.

81466705 is a deficient number, since it is larger than the sum of its proper divisors (16293347).

81466705 is a wasteful number, since it uses less digits than its factorization.

81466705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16293346.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 81466705 is about 9025.8908147617. The cubic root of 81466705 is about 433.5042741102.

The spelling of 81466705 in words is "eighty-one million, four hundred sixty-six thousand, seven hundred five".