18645182776823 has 4 divisors (see below), whose sum is σ = 18685981864320. Its totient is φ = 18604383689328.

The previous prime is 18645182776817. The next prime is 18645182776879. The reversal of 18645182776823 is 32867728154681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18645182776823 - 2¹⁰ = 18645182775799 is a prime.

It is a super-2 number, since 2×18645182776823² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18645182776223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20399543063 + ... + 20399543976.

It is an arithmetic number, because the mean of its divisors is an integer number (4671495466080).

Almost surely, 2^{18645182776823} is an apocalyptic number.

18645182776823 is a deficient number, since it is larger than the sum of its proper divisors (40799087497).

18645182776823 is an equidigital number, since it uses as much as digits as its factorization.

18645182776823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40799087496.

The product of its digits is 216760320, while the sum is 68.

The spelling of 18645182776823 in words is "eighteen trillion, six hundred forty-five billion, one hundred eighty-two million, seven hundred seventy-six thousand, eight hundred twenty-three".