18534043551 has 8 divisors (see below), whose sum is σ = 24720127744. Its totient is φ = 12351994200.

The previous prime is 18534043513. The next prime is 18534043621. The reversal of 18534043551 is 15534043581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18534043551 - 2⁹ = 18534043039 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 (18534043651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 997975 + ... + 1016376.

It is an arithmetic number, because the mean of its divisors is an integer number (3090015968).

Almost surely, 2^18534043551 is an apocalyptic number.

18534043551 is a deficient number, since it is larger than the sum of its proper divisors (6186084193).

18534043551 is a wasteful number, since it uses less digits than its factorization.

18534043551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2017421.

The product of its (nonzero) digits is 144000, while the sum is 39.

It can be divided in two parts, 1853 and 4043551, that added together give a palindrome (4045404).

The spelling of 18534043551 in words is "eighteen billion, five hundred thirty-four million, forty-three thousand, five hundred fifty-one".