81243455260 has 96 divisors (see below), whose sum is σ = 197382951360. Its totient is φ = 27761049600.

The previous prime is 81243455219. The next prime is 81243455263. The reversal of 81243455260 is 6255434218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81243455263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2380396 + ... + 2414284.

It is an arithmetic number, because the mean of its divisors is an integer number (2056072410).

Almost surely, 2^81243455260 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 81243455260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98691475680).

81243455260 is an abundant number, since it is smaller than the sum of its proper divisors (116139496100).

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

81243455260 is a wasteful number, since it uses less digits than its factorization.

81243455260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34567 (or 34565 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

Adding to 81243455260 its reverse (6255434218), we get a palindrome (87498889478).

The spelling of 81243455260 in words is "eighty-one billion, two hundred forty-three million, four hundred fifty-five thousand, two hundred sixty".