81128144248 has 16 divisors (see below), whose sum is σ = 152337997080. Its totient is φ = 40504678368.

The previous prime is 81128144233. The next prime is 81128144261. The reversal of 81128144248 is 84244182118.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7418415 + ... + 7429342.

Almost surely, 2^81128144248 is an apocalyptic number.

It is an amenable number.

81128144248 is a deficient number, since it is larger than the sum of its proper divisors (71209852832).

81128144248 is a wasteful number, since it uses less digits than its factorization.

81128144248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14848446 (or 14848442 counting only the distinct ones).

The product of its digits is 131072, while the sum is 43.

The spelling of 81128144248 in words is "eighty-one billion, one hundred twenty-eight million, one hundred forty-four thousand, two hundred forty-eight".