81013325310 has 144 divisors (see below), whose sum is σ = 219332271600. Its totient is φ = 21543594624.

The previous prime is 81013325297. The next prime is 81013325311. The reversal of 81013325310 is 1352331018.

81013325310 is a `hidden beast` number, since 8 + 10 + 1 + 332 + 5 + 310 = 666.

It is a super-2 number, since 2×81013325310² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81013325311) by changing a digit.

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, 26832981 + ... + 26835999.

It is an arithmetic number, because the mean of its divisors is an integer number (1523140775).

Almost surely, 2^81013325310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81013325310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109666135800).

81013325310 is an abundant number, since it is smaller than the sum of its proper divisors (138318946290).

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

81013325310 is an equidigital number, since it uses as much as digits as its factorization.

81013325310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3459 (or 3438 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 81013325310 its reverse (1352331018), we get a palindrome (82365656328).

The spelling of 81013325310 in words is "eighty-one billion, thirteen million, three hundred twenty-five thousand, three hundred ten".