81136006238 has 24 divisors (see below), whose sum is σ = 144866479032. Its totient is φ = 33963907824.

The previous prime is 81136006181. The next prime is 81136006253. The reversal of 81136006238 is 83260063118.

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 11 ways as a sum of consecutive naturals, for example, 9622745 + ... + 9631172.

It is an arithmetic number, because the mean of its divisors is an integer number (6036103293).

Almost surely, 2^81136006238 is an apocalyptic number.

81136006238 is a deficient number, since it is larger than the sum of its proper divisors (63730472794).

81136006238 is a wasteful number, since it uses less digits than its factorization.

81136006238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19253976 (or 19253969 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 81136006238 in words is "eighty-one billion, one hundred thirty-six million, six thousand, two hundred thirty-eight".