81466675671 has 16 divisors (see below), whose sum is σ = 113509036800. Its totient is φ = 51874553280.

The previous prime is 81466675663. The next prime is 81466675721. The reversal of 81466675671 is 17657666418.

It is not a de Polignac number, because 81466675671 - 2³ = 81466675663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81466675651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 806646 + ... + 902003.

It is an arithmetic number, because the mean of its divisors is an integer number (7094314800).

Almost surely, 2^81466675671 is an apocalyptic number.

81466675671 is a deficient number, since it is larger than the sum of its proper divisors (32042361129).

81466675671 is a wasteful number, since it uses less digits than its factorization.

81466675671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709366.

The product of its digits is 10160640, while the sum is 57.

The spelling of 81466675671 in words is "eighty-one billion, four hundred sixty-six million, six hundred seventy-five thousand, six hundred seventy-one".