18383767647473 has 4 divisors (see below), whose sum is σ = 18573291025380. Its totient is φ = 18194244269568.

The previous prime is 18383767647463. The next prime is 18383767647517. The reversal of 18383767647473 is 37474676738381.

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 12498713763904 + 5885053883569 = 3535352^2 + 2425913^2 .

It is a cyclic number.

It is not a de Polignac number, because 18383767647473 - 2⁶ = 18383767647409 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 18383767647473.

It is not an unprimeable number, because it can be changed into a prime (18383767647463) 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, 94761688808 + ... + 94761689001.

It is an arithmetic number, because the mean of its divisors is an integer number (4643322756345).

Almost surely, 2^{18383767647473} is an apocalyptic number.

It is an amenable number.

18383767647473 is a deficient number, since it is larger than the sum of its proper divisors (189523377907).

18383767647473 is an equidigital number, since it uses as much as digits as its factorization.

18383767647473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189523377906.

The product of its digits is 2389782528, while the sum is 74.

It can be divided in two parts, 1838376 and 7647473, that added together give a palindrome (9485849).

The spelling of 18383767647473 in words is "eighteen trillion, three hundred eighty-three billion, seven hundred sixty-seven million, six hundred forty-seven thousand, four hundred seventy-three".