81343373406 has 32 divisors (see below), whose sum is σ = 173780974368. Its totient is φ = 25293649920.

The previous prime is 81343373399. The next prime is 81343373473. The reversal of 81343373406 is 60437334318.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3517165 + ... + 3540216.

It is an arithmetic number, because the mean of its divisors is an integer number (5430655449).

Almost surely, 2^81343373406 is an apocalyptic number.

81343373406 is an abundant number, since it is smaller than the sum of its proper divisors (92437600962).

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

81343373406 is a wasteful number, since it uses less digits than its factorization.

81343373406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7057516.

The product of its (nonzero) digits is 435456, while the sum is 42.

The spelling of 81343373406 in words is "eighty-one billion, three hundred forty-three million, three hundred seventy-three thousand, four hundred six".