81283459422447 has 6 divisors (see below), whose sum is σ = 117409441387992. Its totient is φ = 54188972948292.

The previous prime is 81283459422439. The next prime is 81283459422479. The reversal of 81283459422447 is 74422495438218.

81283459422447 is a `hidden beast` number, since 8 + 1 + 2 + 8 + 34 + 594 + 2 + 2 + 4 + 4 + 7 = 666.

It is not a de Polignac number, because 81283459422447 - 2³ = 81283459422439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81283459420447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4515747745683 + ... + 4515747745700.

It is an arithmetic number, because the mean of its divisors is an integer number (19568240231332).

Almost surely, 2^{81283459422447} is an apocalyptic number.

81283459422447 is a deficient number, since it is larger than the sum of its proper divisors (36125981965545).

81283459422447 is a wasteful number, since it uses less digits than its factorization.

81283459422447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9031495491389 (or 9031495491386 counting only the distinct ones).

The product of its digits is 123863040, while the sum is 63.

The spelling of 81283459422447 in words is "eighty-one trillion, two hundred eighty-three billion, four hundred fifty-nine million, four hundred twenty-two thousand, four hundred forty-seven".