268843521743987 has 2 divisors, whose sum is σ = 268843521743988. Its totient is φ = 268843521743986.

The previous prime is 268843521743963. The next prime is 268843521744001. The reversal of 268843521743987 is 789347125348862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268843521743987 - 2¹⁶ = 268843521678451 is a prime.

It is a super-2 number, since 2×268843521743987² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (268843521743387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134421760871993 + 134421760871994.

It is an arithmetic number, because the mean of its divisors is an integer number (134421760871994).

Almost surely, 2^{268843521743987} is an apocalyptic number.

268843521743987 is a deficient number, since it is larger than the sum of its proper divisors (1).

268843521743987 is an equidigital number, since it uses as much as digits as its factorization.

268843521743987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3901685760, while the sum is 77.

The spelling of 268843521743987 in words is "two hundred sixty-eight trillion, eight hundred forty-three billion, five hundred twenty-one million, seven hundred forty-three thousand, nine hundred eighty-seven".