18203813266 has 32 divisors (see below), whose sum is σ = 28820655360. Its totient is φ = 8606247936.

The previous prime is 18203813179. The next prime is 18203813267. The reversal of 18203813266 is 66231830281.

It is not an unprimeable number, because it can be changed into a prime (18203813267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4892955 + ... + 4896673.

It is an arithmetic number, because the mean of its divisors is an integer number (900645480).

Almost surely, 2^18203813266 is an apocalyptic number.

18203813266 is a deficient number, since it is larger than the sum of its proper divisors (10616842094).

18203813266 is a wasteful number, since it uses less digits than its factorization.

18203813266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4938.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 18203813266 in words is "eighteen billion, two hundred three million, eight hundred thirteen thousand, two hundred sixty-six".