81344012916 has 48 divisors (see below), whose sum is σ = 191811401600. Its totient is φ = 26829221760.

The previous prime is 81344012891. The next prime is 81344012921. The reversal of 81344012916 is 61921044318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338130 + ... + 526326.

Almost surely, 2^81344012916 is an apocalyptic number.

It is an amenable number.

81344012916 is an abundant number, since it is smaller than the sum of its proper divisors (110467388684).

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

81344012916 is a wasteful number, since it uses less digits than its factorization.

81344012916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188584 (or 188582 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 81344012916 in words is "eighty-one billion, three hundred forty-four million, twelve thousand, nine hundred sixteen".