81093183647 has 32 divisors (see below), whose sum is σ = 94838833152. Its totient is φ = 67908788064.

The previous prime is 81093183637. The next prime is 81093183649. The reversal of 81093183647 is 74638139018.

It is a cyclic number.

It is not a de Polignac number, because 81093183647 - 2¹² = 81093179551 is a prime.

It is a super-2 number, since 2×81093183647² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81093183595 and 81093183604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81093183649) 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 31 ways as a sum of consecutive naturals, for example, 61109498 + ... + 61110824.

It is an arithmetic number, because the mean of its divisors is an integer number (2963713536).

Almost surely, 2^81093183647 is an apocalyptic number.

81093183647 is a deficient number, since it is larger than the sum of its proper divisors (13745649505).

81093183647 is a wasteful number, since it uses less digits than its factorization.

81093183647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2507.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 81093183647 in words is "eighty-one billion, ninety-three million, one hundred eighty-three thousand, six hundred forty-seven".