18353103218 has 4 divisors (see below), whose sum is σ = 27529654830. Its totient is φ = 9176551608.

The previous prime is 18353103187. The next prime is 18353103233. The reversal of 18353103218 is 81230135381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81230135381 = 179 ⋅453799639.

It can be written as a sum of positive squares in only one way, i.e., 18278228809 + 74874409 = 135197^2 + 8653^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4588275803 + ... + 4588275806.

Almost surely, 2^18353103218 is an apocalyptic number.

18353103218 is a deficient number, since it is larger than the sum of its proper divisors (9176551612).

18353103218 is an equidigital number, since it uses as much as digits as its factorization.

18353103218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9176551611.

The product of its (nonzero) digits is 17280, while the sum is 35.

Adding to 18353103218 its reverse (81230135381), we get a palindrome (99583238599).

The spelling of 18353103218 in words is "eighteen billion, three hundred fifty-three million, one hundred three thousand, two hundred eighteen".