81532015110 has 384 divisors, whose sum is σ = 275393664000. Its totient is φ = 16251964416.

The previous prime is 81532015067. The next prime is 81532015127. The reversal of 81532015110 is 1151023518.

81532015110 is a `hidden beast` number, since 8 + 1 + 532 + 0 + 15 + 110 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 110327121 + ... + 110327859.

It is an arithmetic number, because the mean of its divisors is an integer number (717171000).

Almost surely, 2^81532015110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81532015110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137696832000).

81532015110 is an abundant number, since it is smaller than the sum of its proper divisors (193861648890).

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

81532015110 is a wasteful number, since it uses less digits than its factorization.

81532015110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500 (or 1497 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

Adding to 81532015110 its reverse (1151023518), we get a palindrome (82683038628).

The spelling of 81532015110 in words is "eighty-one billion, five hundred thirty-two million, fifteen thousand, one hundred ten".