81112684261 has 8 divisors (see below), whose sum is σ = 92709182720. Its totient is φ = 69518428848.

The previous prime is 81112684243. The next prime is 81112684291. The reversal of 81112684261 is 16248621118.

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 81112684261 - 2⁵ = 81112684229 is a prime.

It is a super-2 number, since 2×81112684261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81112684201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482541 + ... + 628546.

It is an arithmetic number, because the mean of its divisors is an integer number (11588647840).

Almost surely, 2^81112684261 is an apocalyptic number.

It is an amenable number.

81112684261 is a deficient number, since it is larger than the sum of its proper divisors (11596498459).

81112684261 is a wasteful number, since it uses less digits than its factorization.

81112684261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121523.

The product of its digits is 36864, while the sum is 40.

The spelling of 81112684261 in words is "eighty-one billion, one hundred twelve million, six hundred eighty-four thousand, two hundred sixty-one".