268815518863 has 2 divisors, whose sum is σ = 268815518864. Its totient is φ = 268815518862.

The previous prime is 268815518837. The next prime is 268815518869. The reversal of 268815518863 is 368815518862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268815518863 - 2¹³ = 268815510671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268815518869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134407759431 + 134407759432.

It is an arithmetic number, because the mean of its divisors is an integer number (134407759432).

Almost surely, 2^268815518863 is an apocalyptic number.

268815518863 is a deficient number, since it is larger than the sum of its proper divisors (1).

268815518863 is an equidigital number, since it uses as much as digits as its factorization.

268815518863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22118400, while the sum is 61.

Subtracting 268815518863 from its reverse (368815518862), we obtain a palindrome (99999999999).

The spelling of 268815518863 in words is "two hundred sixty-eight billion, eight hundred fifteen million, five hundred eighteen thousand, eight hundred sixty-three".