81541186033 has 4 divisors (see below), whose sum is σ = 81866051568. Its totient is φ = 81216320500.

The previous prime is 81541186031. The next prime is 81541186063. The reversal of 81541186033 is 33068114518.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81541186033 - 2¹ = 81541186031 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81541186031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162432391 + ... + 162432892.

It is an arithmetic number, because the mean of its divisors is an integer number (20466512892).

Almost surely, 2^81541186033 is an apocalyptic number.

It is an amenable number.

81541186033 is a deficient number, since it is larger than the sum of its proper divisors (324865535).

81541186033 is a wasteful number, since it uses less digits than its factorization.

81541186033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324865534.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 81541186033 in words is "eighty-one billion, five hundred forty-one million, one hundred eighty-six thousand, thirty-three".