81040415068 has 12 divisors (see below), whose sum is σ = 142131059392. Its totient is φ = 40431540960.

The previous prime is 81040415051. The next prime is 81040415083. The reversal of 81040415068 is 86051404018.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22164588 + ... + 22168243.

Almost surely, 2^81040415068 is an apocalyptic number.

It is an amenable number.

81040415068 is a deficient number, since it is larger than the sum of its proper divisors (61090644324).

81040415068 is a wasteful number, since it uses less digits than its factorization.

81040415068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44333292 (or 44333290 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The spelling of 81040415068 in words is "eighty-one billion, forty million, four hundred fifteen thousand, sixty-eight".