81768486718 has 8 divisors (see below), whose sum is σ = 122653949112. Its totient is φ = 40883837016.

The previous prime is 81768486661. The next prime is 81768486721.

81768486718 is nontrivially palindromic in base 10.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81768486718.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255096 + ... + 478132.

It is an arithmetic number, because the mean of its divisors is an integer number (15331743639).

Almost surely, 2^81768486718 is an apocalyptic number.

81768486718 is a deficient number, since it is larger than the sum of its proper divisors (40885462394).

81768486718 is a wasteful number, since it uses less digits than its factorization.

81768486718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406346.

The product of its digits is 28901376, while the sum is 64.

The spelling of 81768486718 in words is "eighty-one billion, seven hundred sixty-eight million, four hundred eighty-six thousand, seven hundred eighteen".