268856236657 has 4 divisors (see below), whose sum is σ = 268858172416. Its totient is φ = 268854300900.

The previous prime is 268856236651. The next prime is 268856236673. The reversal of 268856236657 is 756632658862.

268856236657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 756632658862 = 2 ⋅378316329431.

It is a cyclic number.

It is not a de Polignac number, because 268856236657 - 2¹¹ = 268856234609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268856236651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741969 + ... + 1043182.

It is an arithmetic number, because the mean of its divisors is an integer number (67214543104).

Almost surely, 2^268856236657 is an apocalyptic number.

It is an amenable number.

268856236657 is a deficient number, since it is larger than the sum of its proper divisors (1935759).

268856236657 is a wasteful number, since it uses less digits than its factorization.

268856236657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935758.

The product of its digits is 174182400, while the sum is 64.

The spelling of 268856236657 in words is "two hundred sixty-eight billion, eight hundred fifty-six million, two hundred thirty-six thousand, six hundred fifty-seven".