81083397455423 has 16 divisors (see below), whose sum is σ = 89238628475136. Its totient is φ = 73058853248640.

The previous prime is 81083397455383. The next prime is 81083397455453. The reversal of 81083397455423 is 32455479338018.

It is a Cunningham number, because it is equal to 9004632²-1.

It is a cyclic number.

It is not a de Polignac number, because 81083397455423 - 2¹⁴ = 81083397439039 is a prime.

It is a super-3 number, since 3×81083397455423³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81083397455453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98641640 + ... + 99460242.

It is an arithmetic number, because the mean of its divisors is an integer number (5577414279696).

Almost surely, 2^{81083397455423} is an apocalyptic number.

81083397455423 is a deficient number, since it is larger than the sum of its proper divisors (8155231019713).

81083397455423 is a wasteful number, since it uses less digits than its factorization.

81083397455423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898414.

The product of its (nonzero) digits is 87091200, while the sum is 62.

The spelling of 81083397455423 in words is "eighty-one trillion, eighty-three billion, three hundred ninety-seven million, four hundred fifty-five thousand, four hundred twenty-three".