268561895893 has 2 divisors, whose sum is σ = 268561895894. Its totient is φ = 268561895892.

The previous prime is 268561895867. The next prime is 268561895983. The reversal of 268561895893 is 398598165862.

It is a happy number.

Together with next prime (268561895983) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268471132164 + 90763729 = 518142^2 + 9527^2 .

It is a cyclic number.

It is not a de Polignac number, because 268561895893 - 2¹³ = 268561887701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268561896893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134280947946 + 134280947947.

It is an arithmetic number, because the mean of its divisors is an integer number (134280947947).

Almost surely, 2^268561895893 is an apocalyptic number.

It is an amenable number.

268561895893 is a deficient number, since it is larger than the sum of its proper divisors (1).

268561895893 is an equidigital number, since it uses as much as digits as its factorization.

268561895893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 223948800, while the sum is 70.

The spelling of 268561895893 in words is "two hundred sixty-eight billion, five hundred sixty-one million, eight hundred ninety-five thousand, eight hundred ninety-three".