18898461585 has 48 divisors (see below), whose sum is σ = 33187611600. Its totient is φ = 9947215872.

The previous prime is 18898461563. The next prime is 18898461611. The reversal of 18898461585 is 58516489881.

18898461585 is a `hidden beast` number, since 1 + 8 + 8 + 9 + 8 + 4 + 615 + 8 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 5505491601 + 13392969984 = 74199^2 + 115728^2 .

It is not a de Polignac number, because 18898461585 - 2¹⁷ = 18898330513 is a prime.

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, 2274699 + ... + 2282991.

It is an arithmetic number, because the mean of its divisors is an integer number (691408575).

Almost surely, 2^18898461585 is an apocalyptic number.

18898461585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18898461585 is a deficient number, since it is larger than the sum of its proper divisors (14289150015).

18898461585 is a wasteful number, since it uses less digits than its factorization.

18898461585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8962 (or 8959 counting only the distinct ones).

The product of its digits is 22118400, while the sum is 63.

The spelling of 18898461585 in words is "eighteen billion, eight hundred ninety-eight million, four hundred sixty-one thousand, five hundred eighty-five".