81536846881 has 8 divisors (see below), whose sum is σ = 94712590784. Its totient is φ = 68743008720.

The previous prime is 81536846879. The next prime is 81536846893. The reversal of 81536846881 is 18864863518.

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 81536846881 - 2¹ = 81536846879 is a prime.

It is a super-2 number, since 2×81536846881² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81536846851) 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, 95475975 + ... + 95476828.

It is an arithmetic number, because the mean of its divisors is an integer number (11839073848).

Almost surely, 2^81536846881 is an apocalyptic number.

It is an amenable number.

81536846881 is a deficient number, since it is larger than the sum of its proper divisors (13175743903).

81536846881 is a wasteful number, since it uses less digits than its factorization.

81536846881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190952871.

The product of its digits is 8847360, while the sum is 58.

The spelling of 81536846881 in words is "eighty-one billion, five hundred thirty-six million, eight hundred forty-six thousand, eight hundred eighty-one".