2168304252991 has 8 divisors (see below), whose sum is σ = 2214893713824. Its totient is φ = 2122160624640.

The previous prime is 2168304252967. The next prime is 2168304252997. The reversal of 2168304252991 is 1992524038612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2168304252991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168304252997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111448290 + ... + 111467743.

It is an arithmetic number, because the mean of its divisors is an integer number (276861714228).

Almost surely, 2^{2168304252991} is an apocalyptic number.

2168304252991 is a deficient number, since it is larger than the sum of its proper divisors (46589460833).

2168304252991 is a wasteful number, since it uses less digits than its factorization.

2168304252991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222916241.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 2168304252991 in words is "two trillion, one hundred sixty-eight billion, three hundred four million, two hundred fifty-two thousand, nine hundred ninety-one".