18188068487 has 4 divisors (see below), whose sum is σ = 18193410336. Its totient is φ = 18182726640.

The previous prime is 18188068463. The next prime is 18188068489. The reversal of 18188068487 is 78486088181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78486088181 = 2473 ⋅31737197.

It is a cyclic number.

It is not a de Polignac number, because 18188068487 - 2¹⁰ = 18188067463 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 (18188068489) 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, 2665814 + ... + 2672627.

It is an arithmetic number, because the mean of its divisors is an integer number (4548352584).

Almost surely, 2^18188068487 is an apocalyptic number.

18188068487 is a deficient number, since it is larger than the sum of its proper divisors (5341849).

18188068487 is an equidigital number, since it uses as much as digits as its factorization.

18188068487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5341848.

The product of its (nonzero) digits is 5505024, while the sum is 59.

The spelling of 18188068487 in words is "eighteen billion, one hundred eighty-eight million, sixty-eight thousand, four hundred eighty-seven".