268454378558461 has 2 divisors, whose sum is σ = 268454378558462. Its totient is φ = 268454378558460.

The previous prime is 268454378558357. The next prime is 268454378558507. The reversal of 268454378558461 is 164855873454862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182439994491225 + 86014384067236 = 13507035^2 + 9274394^2 .

It is a cyclic number.

It is not a de Polignac number, because 268454378558461 - 2²¹ = 268454376461309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268454378552461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134227189279230 + 134227189279231.

It is an arithmetic number, because the mean of its divisors is an integer number (134227189279231).

Almost surely, 2^{268454378558461} is an apocalyptic number.

It is an amenable number.

268454378558461 is a deficient number, since it is larger than the sum of its proper divisors (1).

268454378558461 is an equidigital number, since it uses as much as digits as its factorization.

268454378558461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6193152000, while the sum is 76.

The spelling of 268454378558461 in words is "two hundred sixty-eight trillion, four hundred fifty-four billion, three hundred seventy-eight million, five hundred fifty-eight thousand, four hundred sixty-one".