18234617855 has 4 divisors (see below), whose sum is σ = 21881541432. Its totient is φ = 14587694280.

The previous prime is 18234617837. The next prime is 18234617881. The reversal of 18234617855 is 55871643281.

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

It is not a de Polignac number, because 18234617855 - 2¹⁰ = 18234616831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1823461781 + ... + 1823461790.

It is an arithmetic number, because the mean of its divisors is an integer number (5470385358).

Almost surely, 2^18234617855 is an apocalyptic number.

18234617855 is a deficient number, since it is larger than the sum of its proper divisors (3646923577).

18234617855 is an equidigital number, since it uses as much as digits as its factorization.

18234617855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646923576.

The product of its digits is 1612800, while the sum is 50.

The spelling of 18234617855 in words is "eighteen billion, two hundred thirty-four million, six hundred seventeen thousand, eight hundred fifty-five".