81067704508 has 24 divisors (see below), whose sum is σ = 162204329952. Its totient is φ = 34728533184.

The previous prime is 81067704503. The next prime is 81067704521. The reversal of 81067704508 is 80540776018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81067704503) 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, 548191 + ... + 680182.

It is an arithmetic number, because the mean of its divisors is an integer number (6758513748).

Almost surely, 2^81067704508 is an apocalyptic number.

It is an amenable number.

81067704508 is an abundant number, since it is smaller than the sum of its proper divisors (81136625444).

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

81067704508 is a wasteful number, since it uses less digits than its factorization.

81067704508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230741 (or 1230739 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The spelling of 81067704508 in words is "eighty-one billion, sixty-seven million, seven hundred four thousand, five hundred eight".