268308489557 has 4 divisors (see below), whose sum is σ = 268311842796. Its totient is φ = 268305136320.

The previous prime is 268308489551. The next prime is 268308489583. The reversal of 268308489557 is 755984803862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144769596196 + 123538893361 = 380486^2 + 351481^2 .

It is a cyclic number.

It is not a de Polignac number, because 268308489557 - 2¹⁰ = 268308488533 is a prime.

It is a super-3 number, since 3×268308489557³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 268308489493 and 268308489502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268308489551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1553588 + ... + 1717629.

It is an arithmetic number, because the mean of its divisors is an integer number (67077960699).

Almost surely, 2^268308489557 is an apocalyptic number.

It is an amenable number.

268308489557 is a deficient number, since it is larger than the sum of its proper divisors (3353239).

268308489557 is an equidigital number, since it uses as much as digits as its factorization.

268308489557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353238.

The product of its (nonzero) digits is 116121600, while the sum is 65.

The spelling of 268308489557 in words is "two hundred sixty-eight billion, three hundred eight million, four hundred eighty-nine thousand, five hundred fifty-seven".