13866491187 has 6 divisors (see below), whose sum is σ = 20029376172. Its totient is φ = 9244327452.

The previous prime is 13866491173. The next prime is 13866491207. The reversal of 13866491187 is 78119466831.

13866491187 is a `hidden beast` number, since 13 + 8 + 66 + 491 + 1 + 87 = 666.

It is not a de Polignac number, because 13866491187 - 2⁸ = 13866490931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13866493187) 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, 770360613 + ... + 770360630.

It is an arithmetic number, because the mean of its divisors is an integer number (3338229362).

Almost surely, 2^13866491187 is an apocalyptic number.

13866491187 is a deficient number, since it is larger than the sum of its proper divisors (6162884985).

13866491187 is a wasteful number, since it uses less digits than its factorization.

13866491187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540721249 (or 1540721246 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 13866491187 in words is "thirteen billion, eight hundred sixty-six million, four hundred ninety-one thousand, one hundred eighty-seven".