268191917291 has 4 divisors (see below), whose sum is σ = 268476925584. Its totient is φ = 267906909000.

The previous prime is 268191917221. The next prime is 268191917297. The reversal of 268191917291 is 192719191862.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268191917291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268191917297) 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, 142502735 + ... + 142504616.

It is an arithmetic number, because the mean of its divisors is an integer number (67119231396).

Almost surely, 2^268191917291 is an apocalyptic number.

268191917291 is a deficient number, since it is larger than the sum of its proper divisors (285008293).

268191917291 is an equidigital number, since it uses as much as digits as its factorization.

268191917291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285008292.

The product of its digits is 979776, while the sum is 56.

The spelling of 268191917291 in words is "two hundred sixty-eight billion, one hundred ninety-one million, nine hundred seventeen thousand, two hundred ninety-one".