2188678161 has 16 divisors (see below), whose sum is σ = 2942486784. Its totient is φ = 1447016064.

The previous prime is 2188678157. The next prime is 2188678207. The reversal of 2188678161 is 1618768812.

It is a happy number.

It is not a de Polignac number, because 2188678161 - 2² = 2188678157 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2188678161.

It is not an unprimeable number, because it can be changed into a prime (2188678061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543391 + ... + 547403.

It is an arithmetic number, because the mean of its divisors is an integer number (183905424).

Almost surely, 2^2188678161 is an apocalyptic number.

It is an amenable number.

2188678161 is a deficient number, since it is larger than the sum of its proper divisors (753808623).

2188678161 is a wasteful number, since it uses less digits than its factorization.

2188678161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5480.

The product of its digits is 258048, while the sum is 48.

The square root of 2188678161 is about 46783.3107101240. The cubic root of 2188678161 is about 1298.3565348374.

The spelling of 2188678161 in words is "two billion, one hundred eighty-eight million, six hundred seventy-eight thousand, one hundred sixty-one".