18319637808776 has 8 divisors (see below), whose sum is σ = 34349320891470. Its totient is φ = 9159818904384.

The previous prime is 18319637808763. The next prime is 18319637808779. The reversal of 18319637808776 is 67780873691381.

It can be written as a sum of positive squares in only one way, i.e., 17711253408676 + 608384400100 = 4208474^2 + 779990^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (18319637808779) by changing a digit.

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 as a sum of consecutive naturals, namely, 1144977363041 + ... + 1144977363056.

Almost surely, 2^{18319637808776} is an apocalyptic number.

It is an amenable number.

18319637808776 is a deficient number, since it is larger than the sum of its proper divisors (16029683082694).

18319637808776 is a wasteful number, since it uses less digits than its factorization.

18319637808776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289954726103 (or 2289954726099 counting only the distinct ones).

The product of its (nonzero) digits is 512096256, while the sum is 74.

The spelling of 18319637808776 in words is "eighteen trillion, three hundred nineteen billion, six hundred thirty-seven million, eight hundred eight thousand, seven hundred seventy-six".