81120327457 has 16 divisors (see below), whose sum is σ = 91173962880. Its totient is φ = 71612589312.

The previous prime is 81120327443. The next prime is 81120327511. The reversal of 81120327457 is 75472302118.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81120327457 is a prime.

It is a super-3 number, since 3×81120327457³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81120327427) 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, 2081769 + ... + 2120377.

It is an arithmetic number, because the mean of its divisors is an integer number (5698372680).

Almost surely, 2^81120327457 is an apocalyptic number.

It is an amenable number.

81120327457 is a deficient number, since it is larger than the sum of its proper divisors (10053635423).

81120327457 is a wasteful number, since it uses less digits than its factorization.

81120327457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45672.

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 81120327457 in words is "eighty-one billion, one hundred twenty million, three hundred twenty-seven thousand, four hundred fifty-seven".