81947930255 has 16 divisors (see below), whose sum is σ = 98645722560. Its totient is φ = 65353132032.

The previous prime is 81947930203. The next prime is 81947930269. The reversal of 81947930255 is 55203974918.

It is a cyclic number.

It is not a de Polignac number, because 81947930255 - 2²⁴ = 81931153039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81947930197 and 81947930206.

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 15 ways as a sum of consecutive naturals, for example, 2655977 + ... + 2686653.

It is an arithmetic number, because the mean of its divisors is an integer number (6165357660).

Almost surely, 2^81947930255 is an apocalyptic number.

81947930255 is a deficient number, since it is larger than the sum of its proper divisors (16697792305).

81947930255 is a wasteful number, since it uses less digits than its factorization.

81947930255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32338.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 81947930255 in words is "eighty-one billion, nine hundred forty-seven million, nine hundred thirty thousand, two hundred fifty-five".