81208642911712 has 48 divisors (see below), whose sum is σ = 162897758341920. Its totient is φ = 39837799153152.

The previous prime is 81208642911607. The next prime is 81208642911751. The reversal of 81208642911712 is 21711924680218.

It is a happy number.

It is a super-2 number, since 2×81208642911712² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81208642911712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234507589 + ... + 234853627.

It is an arithmetic number, because the mean of its divisors is an integer number (3393703298790).

Almost surely, 2^{81208642911712} is an apocalyptic number.

It is an amenable number.

81208642911712 is an abundant number, since it is smaller than the sum of its proper divisors (81689115430208).

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

81208642911712 is a wasteful number, since it uses less digits than its factorization.

81208642911712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484475 (or 484467 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 52.

The spelling of 81208642911712 in words is "eighty-one trillion, two hundred eight billion, six hundred forty-two million, nine hundred eleven thousand, seven hundred twelve".