81350426560 has 112 divisors (see below), whose sum is σ = 208943362656. Its totient is φ = 29990080512.

The previous prime is 81350426501. The next prime is 81350426681. The reversal of 81350426560 is 6562405318.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2701507 + ... + 2731453.

It is an arithmetic number, because the mean of its divisors is an integer number (1865565738).

Almost surely, 2^81350426560 is an apocalyptic number.

81350426560 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81350426560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104471681328).

81350426560 is an abundant number, since it is smaller than the sum of its proper divisors (127592936096).

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

81350426560 is a wasteful number, since it uses less digits than its factorization.

81350426560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30630 (or 30620 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 81350426560 in words is "eighty-one billion, three hundred fifty million, four hundred twenty-six thousand, five hundred sixty".