81154158068 has 24 divisors (see below), whose sum is σ = 150404877504. Its totient is φ = 38182320000.

The previous prime is 81154158067. The next prime is 81154158079. The reversal of 81154158068 is 86085145118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81154158067) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 216143 + ... + 457193.

It is an arithmetic number, because the mean of its divisors is an integer number (6266869896).

Almost surely, 2^81154158068 is an apocalyptic number.

It is an amenable number.

81154158068 is a deficient number, since it is larger than the sum of its proper divisors (69250719436).

81154158068 is a wasteful number, since it uses less digits than its factorization.

81154158068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246023 (or 246021 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 47.

The spelling of 81154158068 in words is "eighty-one billion, one hundred fifty-four million, one hundred fifty-eight thousand, sixty-eight".