18594477985 has 4 divisors (see below), whose sum is σ = 22313373588. Its totient is φ = 14875582384.

The previous prime is 18594477947. The next prime is 18594477989. The reversal of 18594477985 is 58977449581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58977449581 = 102103 ⋅577627.

It can be written as a sum of positive squares in 2 ways, for example, as 4944761761 + 13649716224 = 70319^2 + 116832^2 .

It is a cyclic number.

It is not a de Polignac number, because 18594477985 - 2¹¹ = 18594475937 is a prime.

It is a super-2 number, since 2×18594477985² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18594477985.

It is not an unprimeable number, because it can be changed into a prime (18594477989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1859447794 + ... + 1859447803.

It is an arithmetic number, because the mean of its divisors is an integer number (5578343397).

Almost surely, 2^18594477985 is an apocalyptic number.

It is an amenable number.

18594477985 is a deficient number, since it is larger than the sum of its proper divisors (3718895603).

18594477985 is an equidigital number, since it uses as much as digits as its factorization.

18594477985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3718895602.

The product of its digits is 101606400, while the sum is 67.

The spelling of 18594477985 in words is "eighteen billion, five hundred ninety-four million, four hundred seventy-seven thousand, nine hundred eighty-five".