81641059089 has 8 divisors (see below), whose sum is σ = 108857915040. Its totient is φ = 54425787936.

The previous prime is 81641059067. The next prime is 81641059099. The reversal of 81641059089 is 98095014618.

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

It is not a de Polignac number, because 81641059089 - 2²⁴ = 81624281873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81641059099) 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, 270279 + ... + 486140.

It is an arithmetic number, because the mean of its divisors is an integer number (13607239380).

Almost surely, 2^81641059089 is an apocalyptic number.

It is an amenable number.

81641059089 is a deficient number, since it is larger than the sum of its proper divisors (27216855951).

81641059089 is a wasteful number, since it uses less digits than its factorization.

81641059089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792399.

The product of its (nonzero) digits is 622080, while the sum is 51.

The spelling of 81641059089 in words is "eighty-one billion, six hundred forty-one million, fifty-nine thousand, eighty-nine".