18538247465 has 32 divisors (see below), whose sum is σ = 24880608000. Its totient is φ = 13223234304.

The previous prime is 18538247461. The next prime is 18538247489. The reversal of 18538247465 is 56474283581.

It is not a de Polignac number, because 18538247465 - 2² = 18538247461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18538247461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 446876 + ... + 486594.

It is an arithmetic number, because the mean of its divisors is an integer number (777519000).

Almost surely, 2^18538247465 is an apocalyptic number.

It is an amenable number.

18538247465 is a deficient number, since it is larger than the sum of its proper divisors (6342360535).

18538247465 is an equidigital number, since it uses as much as digits as its factorization.

18538247465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39794 (or 39760 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 53.

The spelling of 18538247465 in words is "eighteen billion, five hundred thirty-eight million, two hundred forty-seven thousand, four hundred sixty-five".