81357875318 has 16 divisors (see below), whose sum is σ = 123268672800. Its totient is φ = 40268472000.

The previous prime is 81357875279. The next prime is 81357875323.

81357875318 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81357875318² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1103783 + ... + 1175181.

It is an arithmetic number, because the mean of its divisors is an integer number (7704292050).

Almost surely, 2^81357875318 is an apocalyptic number.

81357875318 is a deficient number, since it is larger than the sum of its proper divisors (41910797482).

81357875318 is a wasteful number, since it uses less digits than its factorization.

81357875318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77143.

The product of its digits is 5644800, while the sum is 56.

The spelling of 81357875318 in words is "eighty-one billion, three hundred fifty-seven million, eight hundred seventy-five thousand, three hundred eighteen".