18388343225 has 24 divisors (see below), whose sum is σ = 26302477248. Its totient is φ = 12491294400.

The previous prime is 18388343219. The next prime is 18388343231. The reversal of 18388343225 is 52234388381.

It is an interprime number because it is at equal distance from previous prime (18388343219) and next prime (18388343231).

It is not a de Polignac number, because 18388343225 - 2¹⁰ = 18388342201 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18388343225.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 472286 + ... + 509735.

It is an arithmetic number, because the mean of its divisors is an integer number (1095936552).

Almost surely, 2^18388343225 is an apocalyptic number.

It is an amenable number.

18388343225 is a deficient number, since it is larger than the sum of its proper divisors (7914134023).

18388343225 is a wasteful number, since it uses less digits than its factorization.

18388343225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982145 (or 982140 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 47.

The spelling of 18388343225 in words is "eighteen billion, three hundred eighty-eight million, three hundred forty-three thousand, two hundred twenty-five".