12187884861 has 16 divisors (see below), whose sum is σ = 18062560000. Its totient is φ = 8122361184.

The previous prime is 12187884857. The next prime is 12187884883. The reversal of 12187884861 is 16848878121.

12187884861 is a `hidden beast` number, since 1 + 2 + 1 + 87 + 88 + 486 + 1 = 666.

It is not a de Polignac number, because 12187884861 - 2² = 12187884857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12187884798 and 12187884807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12187884061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1861 + ... + 156138.

It is an arithmetic number, because the mean of its divisors is an integer number (1128910000).

Almost surely, 2^12187884861 is an apocalyptic number.

It is an amenable number.

12187884861 is a deficient number, since it is larger than the sum of its proper divisors (5874675139).

12187884861 is a wasteful number, since it uses less digits than its factorization.

12187884861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160865 (or 160859 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 54.

The spelling of 12187884861 in words is "twelve billion, one hundred eighty-seven million, eight hundred eighty-four thousand, eight hundred sixty-one".