81125452118 has 4 divisors (see below), whose sum is σ = 121688178180. Its totient is φ = 40562726058.

The previous prime is 81125452073. The next prime is 81125452129.

81125452118 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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20281363028 + ... + 20281363031.

It is an arithmetic number, because the mean of its divisors is an integer number (30422044545).

Almost surely, 2^81125452118 is an apocalyptic number.

81125452118 is a deficient number, since it is larger than the sum of its proper divisors (40562726062).

81125452118 is a wasteful number, since it uses less digits than its factorization.

81125452118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40562726061.

The product of its digits is 25600, while the sum is 38.

The spelling of 81125452118 in words is "eighty-one billion, one hundred twenty-five million, four hundred fifty-two thousand, one hundred eighteen".