18663254593 has 4 divisors (see below), whose sum is σ = 18759955588. Its totient is φ = 18566553600.

The previous prime is 18663254567. The next prime is 18663254627. The reversal of 18663254593 is 39545236681.

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 7159190544 + 11504064049 = 84612^2 + 107257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18663254593 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 18663254593.

It is not an unprimeable number, because it can be changed into a prime (18663254503) 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, 48350208 + ... + 48350593.

It is an arithmetic number, because the mean of its divisors is an integer number (4689988897).

Almost surely, 2^18663254593 is an apocalyptic number.

It is an amenable number.

18663254593 is a deficient number, since it is larger than the sum of its proper divisors (96700995).

18663254593 is an equidigital number, since it uses as much as digits as its factorization.

18663254593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96700994.

The product of its digits is 4665600, while the sum is 52.

The spelling of 18663254593 in words is "eighteen billion, six hundred sixty-three million, two hundred fifty-four thousand, five hundred ninety-three".