18669377663 has 4 divisors (see below), whose sum is σ = 18894310008. Its totient is φ = 18444445320.

The previous prime is 18669377653. The next prime is 18669377669. The reversal of 18669377663 is 36677396681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36677396681 = 19 ⋅1930389299.

It is a cyclic number.

It is not a de Polignac number, because 18669377663 - 2²⁰ = 18668329087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18669377596 and 18669377605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18669377669) 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, 112466048 + ... + 112466213.

It is an arithmetic number, because the mean of its divisors is an integer number (4723577502).

Almost surely, 2^18669377663 is an apocalyptic number.

18669377663 is a deficient number, since it is larger than the sum of its proper divisors (224932345).

18669377663 is an equidigital number, since it uses as much as digits as its factorization.

18669377663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224932344.

The product of its digits is 41150592, while the sum is 62.

The spelling of 18669377663 in words is "eighteen billion, six hundred sixty-nine million, three hundred seventy-seven thousand, six hundred sixty-three".