81241581716 has 12 divisors (see below), whose sum is σ = 142410122400. Its totient is φ = 40552975320.

The previous prime is 81241581689. The next prime is 81241581767. The reversal of 81241581716 is 61718514218.

It is a happy number.

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, 16951190 + ... + 16955981.

It is an arithmetic number, because the mean of its divisors is an integer number (11867510200).

Almost surely, 2^81241581716 is an apocalyptic number.

It is an amenable number.

81241581716 is a deficient number, since it is larger than the sum of its proper divisors (61168540684).

81241581716 is a wasteful number, since it uses less digits than its factorization.

81241581716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33907774 (or 33907772 counting only the distinct ones).

The product of its digits is 107520, while the sum is 44.

The spelling of 81241581716 in words is "eighty-one billion, two hundred forty-one million, five hundred eighty-one thousand, seven hundred sixteen".