18538052147 has 4 divisors (see below), whose sum is σ = 18547199736. Its totient is φ = 18528904560.

The previous prime is 18538052089. The next prime is 18538052149. The reversal of 18538052147 is 74125083581.

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 18538052147 - 2¹⁶ = 18537986611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18538052098 and 18538052107.

It is not an unprimeable number, because it can be changed into a prime (18538052149) 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, 4570754 + ... + 4574807.

It is an arithmetic number, because the mean of its divisors is an integer number (4636799934).

Almost surely, 2^18538052147 is an apocalyptic number.

18538052147 is a deficient number, since it is larger than the sum of its proper divisors (9147589).

18538052147 is an equidigital number, since it uses as much as digits as its factorization.

18538052147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9147588.

The product of its (nonzero) digits is 268800, while the sum is 44.

The spelling of 18538052147 in words is "eighteen billion, five hundred thirty-eight million, fifty-two thousand, one hundred forty-seven".