18256386228203 has 4 divisors (see below), whose sum is σ = 18701663941128. Its totient is φ = 17811108515280.

The previous prime is 18256386228193. The next prime is 18256386228221. The reversal of 18256386228203 is 30282268365281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18256386228203 - 2²⁴ = 18256369450987 is a prime.

It is a super-2 number, since 2×18256386228203² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18256386228293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222638856401 + ... + 222638856482.

It is an arithmetic number, because the mean of its divisors is an integer number (4675415985282).

Almost surely, 2^{18256386228203} is an apocalyptic number.

18256386228203 is a deficient number, since it is larger than the sum of its proper divisors (445277712925).

18256386228203 is an equidigital number, since it uses as much as digits as its factorization.

18256386228203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445277712924.

The product of its (nonzero) digits is 13271040, while the sum is 56.

The spelling of 18256386228203 in words is "eighteen trillion, two hundred fifty-six billion, three hundred eighty-six million, two hundred twenty-eight thousand, two hundred three".