81432411571 has 8 divisors (see below), whose sum is σ = 93210354944. Its totient is φ = 69690653640.

The previous prime is 81432411521. The next prime is 81432411611. The reversal of 81432411571 is 17511423418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81432411571 - 2¹⁹ = 81431887283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81432411571.

It is not an unprimeable number, because it can be changed into a prime (81432411521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9041535 + ... + 9050536.

It is an arithmetic number, because the mean of its divisors is an integer number (11651294368).

Almost surely, 2^81432411571 is an apocalyptic number.

81432411571 is a deficient number, since it is larger than the sum of its proper divisors (11777943373).

81432411571 is a wasteful number, since it uses less digits than its factorization.

81432411571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18092721.

The product of its digits is 26880, while the sum is 37.

Adding to 81432411571 its reverse (17511423418), we get a palindrome (98943834989).

The spelling of 81432411571 in words is "eighty-one billion, four hundred thirty-two million, four hundred eleven thousand, five hundred seventy-one".