81611212334 has 16 divisors (see below), whose sum is σ = 126512366400. Its totient is φ = 39458039040.

The previous prime is 81611212321. The next prime is 81611212339. The reversal of 81611212334 is 43321211618.

It is a self number, because there is not a number n which added to its sum of digits gives 81611212334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81611212339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4394534 + ... + 4413065.

It is an arithmetic number, because the mean of its divisors is an integer number (7907022900).

Almost surely, 2^81611212334 is an apocalyptic number.

81611212334 is a deficient number, since it is larger than the sum of its proper divisors (44901154066).

81611212334 is a wasteful number, since it uses less digits than its factorization.

81611212334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8807755.

The product of its digits is 6912, while the sum is 32.

The spelling of 81611212334 in words is "eighty-one billion, six hundred eleven million, two hundred twelve thousand, three hundred thirty-four".