18768533817 has 32 divisors (see below), whose sum is σ = 29065405824. Its totient is φ = 10646553600.

The previous prime is 18768533813. The next prime is 18768533821. The reversal of 18768533817 is 71833586781.

It is an interprime number because it is at equal distance from previous prime (18768533813) and next prime (18768533821).

It is not a de Polignac number, because 18768533817 - 2² = 18768533813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18768533813) 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 in 31 ways as a sum of consecutive naturals, for example, 9123 + ... + 193959.

It is an arithmetic number, because the mean of its divisors is an integer number (908293932).

Almost surely, 2^18768533817 is an apocalyptic number.

18768533817 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18768533817 is a deficient number, since it is larger than the sum of its proper divisors (10296872007).

18768533817 is a wasteful number, since it uses less digits than its factorization.

18768533817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185049.

The product of its digits is 6773760, while the sum is 57.

The spelling of 18768533817 in words is "eighteen billion, seven hundred sixty-eight million, five hundred thirty-three thousand, eight hundred seventeen".