18447047903 has 4 divisors (see below), whose sum is σ = 19249093488. Its totient is φ = 17645002320.

The previous prime is 18447047893. The next prime is 18447047923. The reversal of 18447047903 is 30974074481.

It is a happy number.

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 18447047903 - 2²² = 18442853599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18447047923) 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, 401022758 + ... + 401022803.

It is an arithmetic number, because the mean of its divisors is an integer number (4812273372).

Almost surely, 2^18447047903 is an apocalyptic number.

18447047903 is a deficient number, since it is larger than the sum of its proper divisors (802045585).

18447047903 is an equidigital number, since it uses as much as digits as its factorization.

18447047903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802045584.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 18447047903 in words is "eighteen billion, four hundred forty-seven million, forty-seven thousand, nine hundred three".