81362894168 has 8 divisors (see below), whose sum is σ = 152555426580. Its totient is φ = 40681447080.

The previous prime is 81362894117. The next prime is 81362894177. The reversal of 81362894168 is 86149826318.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5085180878 + ... + 5085180893.

Almost surely, 2^81362894168 is an apocalyptic number.

It is an amenable number.

81362894168 is a deficient number, since it is larger than the sum of its proper divisors (71192532412).

81362894168 is a wasteful number, since it uses less digits than its factorization.

81362894168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10170361777 (or 10170361773 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 56.

The spelling of 81362894168 in words is "eighty-one billion, three hundred sixty-two million, eight hundred ninety-four thousand, one hundred sixty-eight".