18743390065 has 4 divisors (see below), whose sum is σ = 22492068084. Its totient is φ = 14994712048.

The previous prime is 18743390059. The next prime is 18743390131. The reversal of 18743390065 is 56009334781.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5151794176 + 13591595889 = 71776^2 + 116583^2 .

It is a cyclic number.

It is not a de Polignac number, because 18743390065 - 2⁷ = 18743389937 is a prime.

It is a super-2 number, since 2×18743390065² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18743389997 and 18743390024.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1874339002 + ... + 1874339011.

It is an arithmetic number, because the mean of its divisors is an integer number (5623017021).

Almost surely, 2^18743390065 is an apocalyptic number.

It is an amenable number.

18743390065 is a deficient number, since it is larger than the sum of its proper divisors (3748678019).

18743390065 is an equidigital number, since it uses as much as digits as its factorization.

18743390065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748678018.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 18743390065 in words is "eighteen billion, seven hundred forty-three million, three hundred ninety thousand, sixty-five".