81432371265 has 16 divisors (see below), whose sum is σ = 148904907648. Its totient is φ = 37226226816.

The previous prime is 81432371219. The next prime is 81432371269. The reversal of 81432371265 is 56217323418.

It is not a de Polignac number, because 81432371265 - 2¹⁰ = 81432370241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81432371269) 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, 387773092 + ... + 387773301.

It is an arithmetic number, because the mean of its divisors is an integer number (9306556728).

Almost surely, 2^81432371265 is an apocalyptic number.

It is an amenable number.

81432371265 is a deficient number, since it is larger than the sum of its proper divisors (67472536383).

81432371265 is a wasteful number, since it uses less digits than its factorization.

81432371265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775546408.

The product of its digits is 241920, while the sum is 42.

It can be divided in two parts, 814323 and 71265, that added together give a palindrome (885588).

The spelling of 81432371265 in words is "eighty-one billion, four hundred thirty-two million, three hundred seventy-one thousand, two hundred sixty-five".