18210449403 has 24 divisors (see below), whose sum is σ = 27651905008. Its totient is φ = 11973982464.

The previous prime is 18210449401. The next prime is 18210449441. The reversal of 18210449403 is 30494401281.

It is a happy number.

It is not a de Polignac number, because 18210449403 - 2¹ = 18210449401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18210449401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 495550 + ... + 531027.

Almost surely, 2^18210449403 is an apocalyptic number.

18210449403 is a deficient number, since it is larger than the sum of its proper divisors (9441455605).

18210449403 is an equidigital number, since it uses as much as digits as its factorization.

18210449403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026665 (or 1026653 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 18210449403 in words is "eighteen billion, two hundred ten million, four hundred forty-nine thousand, four hundred three".