18665490793 has 4 divisors (see below), whose sum is σ = 19120746708. Its totient is φ = 18210234880.

The previous prime is 18665490791. The next prime is 18665490797. The reversal of 18665490793 is 39709456681.

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 2366627904 + 16298862889 = 48648^2 + 127667^2 .

It is a cyclic number.

It is not a de Polignac number, because 18665490793 - 2¹ = 18665490791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18665490791) 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, 227627896 + ... + 227627977.

It is an arithmetic number, because the mean of its divisors is an integer number (4780186677).

Almost surely, 2^18665490793 is an apocalyptic number.

It is an amenable number.

18665490793 is a deficient number, since it is larger than the sum of its proper divisors (455255915).

18665490793 is an equidigital number, since it uses as much as digits as its factorization.

18665490793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455255914.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 18665490793 in words is "eighteen billion, six hundred sixty-five million, four hundred ninety thousand, seven hundred ninety-three".