18478406585 has 16 divisors (see below), whose sum is σ = 23348588160. Its totient is φ = 14000221440.

The previous prime is 18478406543. The next prime is 18478406591. The reversal of 18478406585 is 58560487481.

It is not a de Polignac number, because 18478406585 - 2¹² = 18478402489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18478406585.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285380 + ... + 344090.

It is an arithmetic number, because the mean of its divisors is an integer number (1459286760).

Almost surely, 2^18478406585 is an apocalyptic number.

It is an amenable number.

18478406585 is a deficient number, since it is larger than the sum of its proper divisors (4870181575).

18478406585 is a wasteful number, since it uses less digits than its factorization.

18478406585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62048.

The product of its (nonzero) digits is 8601600, while the sum is 56.

The spelling of 18478406585 in words is "eighteen billion, four hundred seventy-eight million, four hundred six thousand, five hundred eighty-five".