18643138763 has 4 divisors (see below), whose sum is σ = 19244530368. Its totient is φ = 18041747160.

The previous prime is 18643138739. The next prime is 18643138771. The reversal of 18643138763 is 36783134681.

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 18643138763 - 2¹⁶ = 18643073227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18643138783) 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, 300695756 + ... + 300695817.

It is an arithmetic number, because the mean of its divisors is an integer number (4811132592).

Almost surely, 2^18643138763 is an apocalyptic number.

18643138763 is a deficient number, since it is larger than the sum of its proper divisors (601391605).

18643138763 is an equidigital number, since it uses as much as digits as its factorization.

18643138763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601391604.

The product of its digits is 1741824, while the sum is 50.

The spelling of 18643138763 in words is "eighteen billion, six hundred forty-three million, one hundred thirty-eight thousand, seven hundred sixty-three".