81776140712 has 64 divisors (see below), whose sum is σ = 175782061440. Its totient is φ = 34937625600.

The previous prime is 81776140711. The next prime is 81776140729. The reversal of 81776140712 is 21704167718.

It is not an unprimeable number, because it can be changed into a prime (81776140711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29446268 + ... + 29449044.

It is an arithmetic number, because the mean of its divisors is an integer number (2746594710).

Almost surely, 2^81776140712 is an apocalyptic number.

It is an amenable number.

81776140712 is an abundant number, since it is smaller than the sum of its proper divisors (94005920728).

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

81776140712 is a wasteful number, since it uses less digits than its factorization.

81776140712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242 (or 4238 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 44.

The spelling of 81776140712 in words is "eighty-one billion, seven hundred seventy-six million, one hundred forty thousand, seven hundred twelve".