268716617893 has 2 divisors, whose sum is σ = 268716617894. Its totient is φ = 268716617892.

The previous prime is 268716617857. The next prime is 268716617941. The reversal of 268716617893 is 398716617862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158517848449 + 110198769444 = 398143^2 + 331962^2 .

It is a cyclic number.

It is not a de Polignac number, because 268716617893 - 2²⁵ = 268683063461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268716617843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134358308946 + 134358308947.

It is an arithmetic number, because the mean of its divisors is an integer number (134358308947).

Almost surely, 2^268716617893 is an apocalyptic number.

It is an amenable number.

268716617893 is a deficient number, since it is larger than the sum of its proper divisors (1).

268716617893 is an equidigital number, since it uses as much as digits as its factorization.

268716617893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 64.

The spelling of 268716617893 in words is "two hundred sixty-eight billion, seven hundred sixteen million, six hundred seventeen thousand, eight hundred ninety-three".