81204111140218 has 32 divisors (see below), whose sum is σ = 133703689692672. Its totient is φ = 36682184683200.

The previous prime is 81204111140189. The next prime is 81204111140219.

81204111140218 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (81204111140219) 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, 4581655 + ... + 13542517.

It is an arithmetic number, because the mean of its divisors is an integer number (4178240302896).

Almost surely, 2^{81204111140218} is an apocalyptic number.

81204111140218 is a deficient number, since it is larger than the sum of its proper divisors (52499578552454).

81204111140218 is a wasteful number, since it uses less digits than its factorization.

81204111140218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8963430.

The product of its (nonzero) digits is 4096, while the sum is 34.

It can be divided in two parts, 8120411 and 1140218, that added together give a palindrome (9260629).

The spelling of 81204111140218 in words is "eighty-one trillion, two hundred four billion, one hundred eleven million, one hundred forty thousand, two hundred eighteen".