2163685409 has 16 divisors (see below), whose sum is σ = 2226700800. Its totient is φ = 2101619520.

The previous prime is 2163685399. The next prime is 2163685423. The reversal of 2163685409 is 9045863612.

It is a cyclic number.

It is not a de Polignac number, because 2163685409 - 2¹² = 2163681313 is a prime.

It is a Duffinian number.

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 2163685409.

It is not an unprimeable number, because it can be changed into a prime (2163685499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2857859 + ... + 2858615.

It is an arithmetic number, because the mean of its divisors is an integer number (139168800).

Almost surely, 2^2163685409 is an apocalyptic number.

It is an amenable number.

2163685409 is a deficient number, since it is larger than the sum of its proper divisors (63015391).

2163685409 is a wasteful number, since it uses less digits than its factorization.

2163685409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 2163685409 is about 46515.4319446783. The cubic root of 2163685409 is about 1293.3955789751.

The spelling of 2163685409 in words is "two billion, one hundred sixty-three million, six hundred eighty-five thousand, four hundred nine".