18013911553 has 4 divisors (see below), whose sum is σ = 19651539888. Its totient is φ = 16376283220.

The previous prime is 18013911547. The next prime is 18013911593. The reversal of 18013911553 is 35511931081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18013911553 - 2²⁵ = 17980357121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18013911593) 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, 818814151 + ... + 818814172.

It is an arithmetic number, because the mean of its divisors is an integer number (4912884972).

Almost surely, 2^18013911553 is an apocalyptic number.

It is an amenable number.

18013911553 is a deficient number, since it is larger than the sum of its proper divisors (1637628335).

18013911553 is a wasteful number, since it uses less digits than its factorization.

18013911553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637628334.

The product of its (nonzero) digits is 16200, while the sum is 37.

It can be divided in two parts, 18013 and 911553, that added together give a triangular number (929566 = T₁₃₆₃).

The spelling of 18013911553 in words is "eighteen billion, thirteen million, nine hundred eleven thousand, five hundred fifty-three".