81023278014 has 144 divisors (see below), whose sum is σ = 216013498272. Its totient is φ = 21839279616.

The previous prime is 81023277983. The next prime is 81023278027. The reversal of 81023278014 is 41087232018.

It is a self number, because there is not a number n which added to its sum of digits gives 81023278014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1453522 + ... + 1508234.

It is an arithmetic number, because the mean of its divisors is an integer number (1500093738).

Almost surely, 2^81023278014 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81023278014, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108006749136).

81023278014 is an abundant number, since it is smaller than the sum of its proper divisors (134990220258).

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

81023278014 is a wasteful number, since it uses less digits than its factorization.

81023278014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54831 (or 54821 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The spelling of 81023278014 in words is "eighty-one billion, twenty-three million, two hundred seventy-eight thousand, fourteen".