81327472318 has 8 divisors (see below), whose sum is σ = 122298492312. Its totient is φ = 40561308216.

The previous prime is 81327472283. The next prime is 81327472327.

81327472318 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×81327472318² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51212980 + ... + 51214567.

It is an arithmetic number, because the mean of its divisors is an integer number (15287311539).

Almost surely, 2^81327472318 is an apocalyptic number.

81327472318 is a deficient number, since it is larger than the sum of its proper divisors (40971019994).

81327472318 is a wasteful number, since it uses less digits than its factorization.

81327472318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102427946.

The product of its digits is 451584, while the sum is 46.

The spelling of 81327472318 in words is "eighty-one billion, three hundred twenty-seven million, four hundred seventy-two thousand, three hundred eighteen".