2168959811 has 4 divisors (see below), whose sum is σ = 2169432000. Its totient is φ = 2168487624.

The previous prime is 2168959789. The next prime is 2168959813. The reversal of 2168959811 is 1189598612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2168959811 - 2⁶ = 2168959747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2168959811.

It is not an unprimeable number, because it can be changed into a prime (2168959813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229136 + ... + 238413.

It is an arithmetic number, because the mean of its divisors is an integer number (542358000).

Almost surely, 2^2168959811 is an apocalyptic number.

2168959811 is a deficient number, since it is larger than the sum of its proper divisors (472189).

2168959811 is an equidigital number, since it uses as much as digits as its factorization.

2168959811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472188.

The product of its digits is 311040, while the sum is 50.

The square root of 2168959811 is about 46572.0926199371. The cubic root of 2168959811 is about 1294.4456935112.

The spelling of 2168959811 in words is "two billion, one hundred sixty-eight million, nine hundred fifty-nine thousand, eight hundred eleven".