18053503889 has 8 divisors (see below), whose sum is σ = 19120745160. Its totient is φ = 16986848256.

The previous prime is 18053503849. The next prime is 18053503891. The reversal of 18053503889 is 98830535081.

It can be written as a sum of positive squares in 4 ways, for example, as 587238289 + 17466265600 = 24233^2 + 132160^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-18053503889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18053503829) 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, 82124 + ... + 207005.

It is an arithmetic number, because the mean of its divisors is an integer number (2390093145).

Almost surely, 2^18053503889 is an apocalyptic number.

It is an amenable number.

18053503889 is a deficient number, since it is larger than the sum of its proper divisors (1067241271).

18053503889 is a wasteful number, since it uses less digits than its factorization.

18053503889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292819.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 18053503889 in words is "eighteen billion, fifty-three million, five hundred three thousand, eight hundred eighty-nine".