1068843278557 has 4 divisors (see below), whose sum is σ = 1069205233180. Its totient is φ = 1068481323936.

The previous prime is 1068843278509. The next prime is 1068843278563. The reversal of 1068843278557 is 7558723488601.

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 494924913081 + 573918365476 = 703509^2 + 757574^2 .

It is a cyclic number.

It is not a de Polignac number, because 1068843278557 - 2¹¹ = 1068843276509 is a prime.

It is a super-2 number, since 2×1068843278557² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1068843278257) 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, 180972882 + ... + 180978787.

It is an arithmetic number, because the mean of its divisors is an integer number (267301308295).

Almost surely, 2^{1068843278557} is an apocalyptic number.

It is an amenable number.

1068843278557 is a deficient number, since it is larger than the sum of its proper divisors (361954623).

1068843278557 is an equidigital number, since it uses as much as digits as its factorization.

1068843278557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361954622.

The product of its (nonzero) digits is 90316800, while the sum is 64.

The spelling of 1068843278557 in words is "one trillion, sixty-eight billion, eight hundred forty-three million, two hundred seventy-eight thousand, five hundred fifty-seven".