18155384445 has 32 divisors (see below), whose sum is σ = 31711109760. Its totient is φ = 8796579840.

The previous prime is 18155384417. The next prime is 18155384461. The reversal of 18155384445 is 54448355181.

It is a happy number.

It is not a de Polignac number, because 18155384445 - 2¹⁴ = 18155368061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18155384394 and 18155384403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208737 + ... + 282633.

It is an arithmetic number, because the mean of its divisors is an integer number (990972180).

Almost surely, 2^18155384445 is an apocalyptic number.

18155384445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18155384445 is a deficient number, since it is larger than the sum of its proper divisors (13555725315).

18155384445 is a wasteful number, since it uses less digits than its factorization.

18155384445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75405.

The product of its digits is 1536000, while the sum is 48.

The spelling of 18155384445 in words is "eighteen billion, one hundred fifty-five million, three hundred eighty-four thousand, four hundred forty-five".