81162316608 has 56 divisors (see below), whose sum is σ = 214781465280. Its totient is φ = 27049128960.

The previous prime is 81162316607. The next prime is 81162316633. The reversal of 81162316608 is 80661326118.

It is a self number, because there is not a number n which added to its sum of digits gives 81162316608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81162316601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093213 + ... + 1165091.

Almost surely, 2^81162316608 is an apocalyptic number.

It is an amenable number.

81162316608 is an abundant number, since it is smaller than the sum of its proper divisors (133619148672).

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

81162316608 is a wasteful number, since it uses less digits than its factorization.

81162316608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77775 (or 77765 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 81162316608 in words is "eighty-one billion, one hundred sixty-two million, three hundred sixteen thousand, six hundred eight".