81115523211 has 8 divisors (see below), whose sum is σ = 111642870784. Its totient is φ = 52332595560.

The previous prime is 81115523201. The next prime is 81115523213. The reversal of 81115523211 is 11232551118.

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

It is not a de Polignac number, because 81115523211 - 2²⁹ = 80578652299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81115523213) 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, 436104871 + ... + 436105056.

It is an arithmetic number, because the mean of its divisors is an integer number (13955358848).

Almost surely, 2^81115523211 is an apocalyptic number.

81115523211 is a deficient number, since it is larger than the sum of its proper divisors (30527347573).

81115523211 is a wasteful number, since it uses less digits than its factorization.

81115523211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872209961.

The product of its digits is 2400, while the sum is 30.

The spelling of 81115523211 in words is "eighty-one billion, one hundred fifteen million, five hundred twenty-three thousand, two hundred eleven".