18645566711 has 4 divisors (see below), whose sum is σ = 18692533272. Its totient is φ = 18598600152.

The previous prime is 18645566707. The next prime is 18645566729. The reversal of 18645566711 is 11766554681.

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 18645566711 - 2² = 18645566707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18645566711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18645566741) 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, 23482685 + ... + 23483478.

It is an arithmetic number, because the mean of its divisors is an integer number (4673133318).

Almost surely, 2^18645566711 is an apocalyptic number.

18645566711 is a deficient number, since it is larger than the sum of its proper divisors (46966561).

18645566711 is an equidigital number, since it uses as much as digits as its factorization.

18645566711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46966560.

The product of its digits is 1209600, while the sum is 50.

The spelling of 18645566711 in words is "eighteen billion, six hundred forty-five million, five hundred sixty-six thousand, seven hundred eleven".