81671069244 has 12 divisors (see below), whose sum is σ = 190565828264. Its totient is φ = 27223689744.

The previous prime is 81671069191. The next prime is 81671069267. The reversal of 81671069244 is 44296017618.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 81671069193 and 81671069202.

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, 3402961207 + ... + 3402961230.

Almost surely, 2^81671069244 is an apocalyptic number.

It is an amenable number.

81671069244 is an abundant number, since it is smaller than the sum of its proper divisors (108894759020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81671069244 is a wasteful number, since it uses less digits than its factorization.

81671069244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6805922444 (or 6805922442 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 81671069244 in words is "eighty-one billion, six hundred seventy-one million, sixty-nine thousand, two hundred forty-four".