81148084118 has 4 divisors (see below), whose sum is σ = 121722126180. Its totient is φ = 40574042058.

The previous prime is 81148084117. The next prime is 81148084151.

81148084118 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81148084111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20287021028 + ... + 20287021031.

It is an arithmetic number, because the mean of its divisors is an integer number (30430531545).

Almost surely, 2^81148084118 is an apocalyptic number.

81148084118 is a deficient number, since it is larger than the sum of its proper divisors (40574042062).

81148084118 is a wasteful number, since it uses less digits than its factorization.

81148084118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40574042061.

The product of its (nonzero) digits is 65536, while the sum is 44.

It can be divided in two parts, 811480 and 84118, that added together give a palindrome (895598).

The spelling of 81148084118 in words is "eighty-one billion, one hundred forty-eight million, eighty-four thousand, one hundred eighteen".