81272458009 has 16 divisors (see below), whose sum is σ = 83403302400. Its totient is φ = 79152950016.

The previous prime is 81272457977. The next prime is 81272458021. The reversal of 81272458009 is 90085427218.

It is a cyclic number.

It is not a de Polignac number, because 81272458009 - 2⁵ = 81272457977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81272458009.

It is not an unprimeable number, because it can be changed into a prime (81272258009) 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 15 ways as a sum of consecutive naturals, for example, 26308737 + ... + 26311825.

It is an arithmetic number, because the mean of its divisors is an integer number (5212706400).

Almost surely, 2^81272458009 is an apocalyptic number.

It is an amenable number.

81272458009 is a deficient number, since it is larger than the sum of its proper divisors (2130844391).

81272458009 is a wasteful number, since it uses less digits than its factorization.

81272458009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 81272458009 in words is "eighty-one billion, two hundred seventy-two million, four hundred fifty-eight thousand, nine".