81147274118 has 8 divisors (see below), whose sum is σ = 121732071240. Its totient is φ = 40569917040.

The previous prime is 81147274111. The next prime is 81147274123.

81147274118 is nontrivially palindromic in base 10.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81147274111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1832663 + ... + 1876418.

It is an arithmetic number, because the mean of its divisors is an integer number (15216508905).

Almost surely, 2^81147274118 is an apocalyptic number.

81147274118 is a deficient number, since it is larger than the sum of its proper divisors (40584797122).

81147274118 is a wasteful number, since it uses less digits than its factorization.

81147274118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3720022.

The product of its digits is 100352, while the sum is 44.

The spelling of 81147274118 in words is "eighty-one billion, one hundred forty-seven million, two hundred seventy-four thousand, one hundred eighteen".