81835314438 has 16 divisors (see below), whose sum is σ = 165291131376. Its totient is φ = 27008354400.

The previous prime is 81835314433. The next prime is 81835314487. The reversal of 81835314438 is 83441353818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81835314433) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 67520281 + ... + 67521492.

It is an arithmetic number, because the mean of its divisors is an integer number (10330695711).

Almost surely, 2^81835314438 is an apocalyptic number.

81835314438 is an abundant number, since it is smaller than the sum of its proper divisors (83455816938).

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

81835314438 is a wasteful number, since it uses less digits than its factorization.

81835314438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135041879.

The product of its digits is 1105920, while the sum is 48.

The spelling of 81835314438 in words is "eighty-one billion, eight hundred thirty-five million, three hundred fourteen thousand, four hundred thirty-eight".