18888338965 has 4 divisors (see below), whose sum is σ = 22666006764. Its totient is φ = 15110671168.

The previous prime is 18888338933. The next prime is 18888338977. The reversal of 18888338965 is 56983388881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56983388881 = 23 ⋅2477538647.

It can be written as a sum of positive squares in 2 ways, for example, as 10490266084 + 8398072881 = 102422^2 + 91641^2 .

It is a cyclic number.

It is not a de Polignac number, because 18888338965 - 2⁵ = 18888338933 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 18888338965.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1888833892 + ... + 1888833901.

It is an arithmetic number, because the mean of its divisors is an integer number (5666501691).

Almost surely, 2^18888338965 is an apocalyptic number.

It is an amenable number.

18888338965 is a deficient number, since it is larger than the sum of its proper divisors (3777667799).

18888338965 is an equidigital number, since it uses as much as digits as its factorization.

18888338965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3777667798.

The product of its digits is 79626240, while the sum is 67.

The spelling of 18888338965 in words is "eighteen billion, eight hundred eighty-eight million, three hundred thirty-eight thousand, nine hundred sixty-five".