81067744040 has 32 divisors (see below), whose sum is σ = 185493996000. Its totient is φ = 31877484864.

The previous prime is 81067744013. The next prime is 81067744061. The reversal of 81067744040 is 4044776018.

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, 17173010 + ... + 17177729.

It is an arithmetic number, because the mean of its divisors is an integer number (5796687375).

Almost surely, 2^81067744040 is an apocalyptic number.

It is an amenable number.

81067744040 is an abundant number, since it is smaller than the sum of its proper divisors (104426251960).

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

81067744040 is a wasteful number, since it uses less digits than its factorization.

81067744040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34350809 (or 34350805 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 41.

The spelling of 81067744040 in words is "eighty-one billion, sixty-seven million, seven hundred forty-four thousand, forty".