18478605599 has 4 divisors (see below), whose sum is σ = 18481427736. Its totient is φ = 18475783464.

The previous prime is 18478605571. The next prime is 18478605631. The reversal of 18478605599 is 99550687481.

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 18478605599 - 2¹⁶ = 18478540063 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 (18478605529) 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 3 ways as a sum of consecutive naturals, for example, 1401224 + ... + 1414349.

It is an arithmetic number, because the mean of its divisors is an integer number (4620356934).

Almost surely, 2^18478605599 is an apocalyptic number.

18478605599 is a deficient number, since it is larger than the sum of its proper divisors (2822137).

18478605599 is an equidigital number, since it uses as much as digits as its factorization.

18478605599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2822136.

The product of its (nonzero) digits is 21772800, while the sum is 62.

The spelling of 18478605599 in words is "eighteen billion, four hundred seventy-eight million, six hundred five thousand, five hundred ninety-nine".