81066496784 has 40 divisors (see below), whose sum is σ = 193312418880. Its totient is φ = 32070261888.

The previous prime is 81066496783. The next prime is 81066496787. The reversal of 81066496784 is 48769466018.

It is not an unprimeable number, because it can be changed into a prime (81066496783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27837314 + ... + 27840225.

It is an arithmetic number, because the mean of its divisors is an integer number (4832810472).

Almost surely, 2^81066496784 is an apocalyptic number.

It is an amenable number.

81066496784 is an abundant number, since it is smaller than the sum of its proper divisors (112245922096).

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

81066496784 is a wasteful number, since it uses less digits than its factorization.

81066496784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55677567 (or 55677561 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 59.

The spelling of 81066496784 in words is "eighty-one billion, sixty-six million, four hundred ninety-six thousand, seven hundred eighty-four".