81788284107 has 12 divisors (see below), whose sum is σ = 118322944584. Its totient is φ = 54440455680.

The previous prime is 81788284057. The next prime is 81788284121. The reversal of 81788284107 is 70148288718.

It is a happy number.

81788284107 is a `hidden beast` number, since 81 + 78 + 82 + 8 + 410 + 7 = 666.

It is not a de Polignac number, because 81788284107 - 2⁶ = 81788284043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81788284177) 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 11 ways as a sum of consecutive naturals, for example, 7082833 + ... + 7094370.

It is an arithmetic number, because the mean of its divisors is an integer number (9860245382).

Almost surely, 2^81788284107 is an apocalyptic number.

81788284107 is a deficient number, since it is larger than the sum of its proper divisors (36534660477).

81788284107 is a wasteful number, since it uses less digits than its factorization.

81788284107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14177850 (or 14177847 counting only the distinct ones).

The product of its (nonzero) digits is 1605632, while the sum is 54.

The spelling of 81788284107 in words is "eighty-one billion, seven hundred eighty-eight million, two hundred eighty-four thousand, one hundred seven".