81736766216 has 32 divisors (see below), whose sum is σ = 184368648000. Its totient is φ = 33186355776.

The previous prime is 81736766203. The next prime is 81736766257. The reversal of 81736766216 is 61266763718.

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, 38409071 + ... + 38411198.

It is an arithmetic number, because the mean of its divisors is an integer number (5761520250).

Almost surely, 2^81736766216 is an apocalyptic number.

It is an amenable number.

81736766216 is an abundant number, since it is smaller than the sum of its proper divisors (102631881784).

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

81736766216 is a wasteful number, since it uses less digits than its factorization.

81736766216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76820301 (or 76820297 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 53.

The spelling of 81736766216 in words is "eighty-one billion, seven hundred thirty-six million, seven hundred sixty-six thousand, two hundred sixteen".