81010110010101 has 16 divisors (see below), whose sum is σ = 109550167676928. Its totient is φ = 53238609662000.

The previous prime is 81010110010087. The next prime is 81010110010111. The reversal of 81010110010101 is 10101001101018.

It is a cyclic number.

It is not a de Polignac number, because 81010110010101 - 2¹⁷ = 81010109879029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81010110010111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25164225 + ... + 28200326.

It is an arithmetic number, because the mean of its divisors is an integer number (6846885479808).

Almost surely, 2^{81010110010101} is an apocalyptic number.

It is an amenable number.

81010110010101 is a deficient number, since it is larger than the sum of its proper divisors (28540057666827).

81010110010101 is a wasteful number, since it uses less digits than its factorization.

81010110010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53371752.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 81010110010101 its reverse (10101001101018), we get a palindrome (91111111111119).

The spelling of 81010110010101 in words is "eighty-one trillion, ten billion, one hundred ten million, ten thousand, one hundred one".