18916972585 has 48 divisors (see below), whose sum is σ = 27094706496. Its totient is φ = 12635263872.

The previous prime is 18916972577. The next prime is 18916972597. The reversal of 18916972585 is 58527961981.

It is not a de Polignac number, because 18916972585 - 2³ = 18916972577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4180134 + ... + 4184656.

It is an arithmetic number, because the mean of its divisors is an integer number (564473052).

Almost surely, 2^18916972585 is an apocalyptic number.

It is an amenable number.

18916972585 is a deficient number, since it is larger than the sum of its proper divisors (8177733911).

18916972585 is a wasteful number, since it uses less digits than its factorization.

18916972585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4982 (or 4975 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 61.

The spelling of 18916972585 in words is "eighteen billion, nine hundred sixteen million, nine hundred seventy-two thousand, five hundred eighty-five".