268256819 has 2 divisors, whose sum is σ = 268256820. Its totient is φ = 268256818.

The previous prime is 268256773. The next prime is 268256831. The reversal of 268256819 is 918652862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268256819 - 2¹² = 268252723 is a prime.

It is a super-2 number, since 2×268256819² = 143923441879997522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (268256419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134128409 + 134128410.

It is an arithmetic number, because the mean of its divisors is an integer number (134128410).

Almost surely, 2^268256819 is an apocalyptic number.

268256819 is a deficient number, since it is larger than the sum of its proper divisors (1).

268256819 is an equidigital number, since it uses as much as digits as its factorization.

268256819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 47.

The square root of 268256819 is about 16378.5475241244. The cubic root of 268256819 is about 644.9364510833.

The spelling of 268256819 in words is "two hundred sixty-eight million, two hundred fifty-six thousand, eight hundred nineteen".