81100111011 has 8 divisors (see below), whose sum is σ = 108189429840. Its totient is φ = 54038766432.

The previous prime is 81100111007. The next prime is 81100111031. The reversal of 81100111011 is 11011100118.

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

It is not a de Polignac number, because 81100111011 - 2² = 81100111007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81100111031) 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, 6986796 + ... + 6998393.

It is an arithmetic number, because the mean of its divisors is an integer number (13523678730).

Almost surely, 2^81100111011 is an apocalyptic number.

81100111011 is a deficient number, since it is larger than the sum of its proper divisors (27089318829).

81100111011 is a wasteful number, since it uses less digits than its factorization.

81100111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13987125.

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

Adding to 81100111011 its reverse (11011100118), we get a palindrome (92111211129).

The spelling of 81100111011 in words is "eighty-one billion, one hundred million, one hundred eleven thousand, eleven".