81208437226 has 32 divisors (see below), whose sum is σ = 141287991552. Its totient is φ = 34286017920.

The previous prime is 81208437221. The next prime is 81208437227. The reversal of 81208437226 is 62273480218.

It is not an unprimeable number, because it can be changed into a prime (81208437221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1237350 + ... + 1301326.

It is an arithmetic number, because the mean of its divisors is an integer number (4415249736).

Almost surely, 2^81208437226 is an apocalyptic number.

81208437226 is a deficient number, since it is larger than the sum of its proper divisors (60079554326).

81208437226 is a wasteful number, since it uses less digits than its factorization.

81208437226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65334.

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 81208437226 in words is "eighty-one billion, two hundred eight million, four hundred thirty-seven thousand, two hundred twenty-six".