18323658655 has 4 divisors (see below), whose sum is σ = 21988390392. Its totient is φ = 14658926920.

The previous prime is 18323658643. The next prime is 18323658659. The reversal of 18323658655 is 55685632381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55685632381 = 11971 ⋅4651711.

It is not a de Polignac number, because 18323658655 - 2⁷ = 18323658527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18323658659) 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, 1832365861 + ... + 1832365870.

It is an arithmetic number, because the mean of its divisors is an integer number (5497097598).

Almost surely, 2^18323658655 is an apocalyptic number.

18323658655 is a deficient number, since it is larger than the sum of its proper divisors (3664731737).

18323658655 is an equidigital number, since it uses as much as digits as its factorization.

18323658655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3664731736.

The product of its digits is 5184000, while the sum is 52.

The spelling of 18323658655 in words is "eighteen billion, three hundred twenty-three million, six hundred fifty-eight thousand, six hundred fifty-five".