81065415762 has 144 divisors (see below), whose sum is σ = 193332484800. Its totient is φ = 25410179520.

The previous prime is 81065415689. The next prime is 81065415797. The reversal of 81065415762 is 26751456018.

81065415762 is a `hidden beast` number, since 8 + 10 + 65 + 4 + 1 + 576 + 2 = 666.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 41592364 + ... + 41594312.

It is an arithmetic number, because the mean of its divisors is an integer number (1342586700).

Almost surely, 2^81065415762 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81065415762, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96666242400).

81065415762 is an abundant number, since it is smaller than the sum of its proper divisors (112267069038).

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

81065415762 is a wasteful number, since it uses less digits than its factorization.

81065415762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111 (or 2038 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 81065415762 in words is "eighty-one billion, sixty-five million, four hundred fifteen thousand, seven hundred sixty-two".