18727213887 has 6 divisors (see below), whose sum is σ = 27050420072. Its totient is φ = 12484809252.

The previous prime is 18727213877. The next prime is 18727213931. The reversal of 18727213887 is 78831272781.

It is not a de Polignac number, because 18727213887 - 2⁴ = 18727213871 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 (18727213877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1040400763 + ... + 1040400780.

Almost surely, 2^18727213887 is an apocalyptic number.

18727213887 is a deficient number, since it is larger than the sum of its proper divisors (8323206185).

18727213887 is a wasteful number, since it uses less digits than its factorization.

18727213887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080801549 (or 2080801546 counting only the distinct ones).

The product of its digits is 2107392, while the sum is 54.

The spelling of 18727213887 in words is "eighteen billion, seven hundred twenty-seven million, two hundred thirteen thousand, eight hundred eighty-seven".