18381554349 has 8 divisors (see below), whose sum is σ = 24549521472. Its totient is φ = 12233978400.

The previous prime is 18381554341. The next prime is 18381554363. The reversal of 18381554349 is 94345518381.

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

It is not a de Polignac number, because 18381554349 - 2³ = 18381554341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381554341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5095689 + ... + 5099294.

It is an arithmetic number, because the mean of its divisors is an integer number (3068690184).

Almost surely, 2^18381554349 is an apocalyptic number.

It is an amenable number.

18381554349 is a deficient number, since it is larger than the sum of its proper divisors (6167967123).

18381554349 is a wasteful number, since it uses less digits than its factorization.

18381554349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10195587.

The product of its digits is 2073600, while the sum is 51.

The spelling of 18381554349 in words is "eighteen billion, three hundred eighty-one million, five hundred fifty-four thousand, three hundred forty-nine".