81641289601 has 8 divisors (see below), whose sum is σ = 89674643520. Its totient is φ = 73981580112.

The previous prime is 81641289599. The next prime is 81641289619. The reversal of 81641289601 is 10698214618.

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 81641289601 - 2¹ = 81641289599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81641289671) 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, 93410650 + ... + 93411523.

It is an arithmetic number, because the mean of its divisors is an integer number (11209330440).

Almost surely, 2^81641289601 is an apocalyptic number.

It is an amenable number.

81641289601 is a deficient number, since it is larger than the sum of its proper divisors (8033353919).

81641289601 is a wasteful number, since it uses less digits than its factorization.

81641289601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186822215.

The product of its (nonzero) digits is 165888, while the sum is 46.

The spelling of 81641289601 in words is "eighty-one billion, six hundred forty-one million, two hundred eighty-nine thousand, six hundred one".