81814859060 has 144 divisors (see below), whose sum is σ = 191404781568. Its totient is φ = 29350801920.

The previous prime is 81814859053. The next prime is 81814859069. The reversal of 81814859060 is 6095841818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81814859069) 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 47 ways as a sum of consecutive naturals, for example, 95466152 + ... + 95467008.

It is an arithmetic number, because the mean of its divisors is an integer number (1329199872).

Almost surely, 2^81814859060 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81814859060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95702390784).

81814859060 is an abundant number, since it is smaller than the sum of its proper divisors (109589922508).

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

81814859060 is a wasteful number, since it uses less digits than its factorization.

81814859060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374 (or 1361 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 81814859060 in words is "eighty-one billion, eight hundred fourteen million, eight hundred fifty-nine thousand, sixty".