18047547847 has 12 divisors (see below), whose sum is σ = 21034411776. Its totient is φ = 15439613280.

The previous prime is 18047547823. The next prime is 18047547851. The reversal of 18047547847 is 74874574081.

It is not a de Polignac number, because 18047547847 - 2²³ = 18039159239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18047547857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 327943 + ... + 379000.

It is an arithmetic number, because the mean of its divisors is an integer number (1752867648).

Almost surely, 2^18047547847 is an apocalyptic number.

18047547847 is a deficient number, since it is larger than the sum of its proper divisors (2986863929).

18047547847 is an equidigital number, since it uses as much as digits as its factorization.

18047547847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707478 (or 707471 counting only the distinct ones).

The product of its (nonzero) digits is 7024640, while the sum is 55.

The spelling of 18047547847 in words is "eighteen billion, forty-seven million, five hundred forty-seven thousand, eight hundred forty-seven".