81138693230 has 16 divisors (see below), whose sum is σ = 166913883360. Its totient is φ = 27818980512.

The previous prime is 81138693227. The next prime is 81138693263. The reversal of 81138693230 is 3239683118.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 579562025 + ... + 579562164.

It is an arithmetic number, because the mean of its divisors is an integer number (10432117710).

Almost surely, 2^81138693230 is an apocalyptic number.

81138693230 is an abundant number, since it is smaller than the sum of its proper divisors (85775190130).

81138693230 is a wasteful number, since it uses less digits than its factorization.

81138693230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159124203.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 81138693230 in words is "eighty-one billion, one hundred thirty-eight million, six hundred ninety-three thousand, two hundred thirty".