18120046547 has 12 divisors (see below), whose sum is σ = 19574897160. Its totient is φ = 16765092096.

The previous prime is 18120046537. The next prime is 18120046579. The reversal of 18120046547 is 74564002181.

It is not a de Polignac number, because 18120046547 - 2²⁰ = 18118997971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18120046547.

It is not an unprimeable number, because it can be changed into a prime (18120046517) 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, 514298 + ... + 548399.

It is an arithmetic number, because the mean of its divisors is an integer number (1631241430).

Almost surely, 2^18120046547 is an apocalyptic number.

18120046547 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18120046547 is a deficient number, since it is larger than the sum of its proper divisors (1454850613).

18120046547 is a wasteful number, since it uses less digits than its factorization.

18120046547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062790 (or 1062773 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 18120046547 in words is "eighteen billion, one hundred twenty million, forty-six thousand, five hundred forty-seven".