81368265667 has 8 divisors (see below), whose sum is σ = 88446311856. Its totient is φ = 74407212192.

The previous prime is 81368265659. The next prime is 81368265677. The reversal of 81368265667 is 76656286318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81368265667 - 2³ = 81368265659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81368265637) 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, 29246728 + ... + 29249509.

It is an arithmetic number, because the mean of its divisors is an integer number (11055788982).

Almost surely, 2^81368265667 is an apocalyptic number.

81368265667 is a deficient number, since it is larger than the sum of its proper divisors (7078046189).

81368265667 is a wasteful number, since it uses less digits than its factorization.

81368265667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58496357.

The product of its digits is 17418240, while the sum is 58.

The spelling of 81368265667 in words is "eighty-one billion, three hundred sixty-eight million, two hundred sixty-five thousand, six hundred sixty-seven".