81068104016 has 20 divisors (see below), whose sum is σ = 157075437600. Its totient is φ = 40532507232.

The previous prime is 81068104009. The next prime is 81068104031. The reversal of 81068104016 is 61040186018.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420215 + ... + 581993.

It is an arithmetic number, because the mean of its divisors is an integer number (7853771880).

Almost surely, 2^81068104016 is an apocalyptic number.

It is an amenable number.

81068104016 is a deficient number, since it is larger than the sum of its proper divisors (76007333584).

81068104016 is a wasteful number, since it uses less digits than its factorization.

81068104016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193106 (or 193100 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The spelling of 81068104016 in words is "eighty-one billion, sixty-eight million, one hundred four thousand, sixteen".