68347213489 has 3 divisors (see below), whose sum is σ = 68347474923. Its totient is φ = 68346952056.

The previous prime is 68347213469. The next prime is 68347213499. The reversal of 68347213489 is 98431274386.

The square root of 68347213489 is 261433.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98431274386 = 2 ⋅49215637193.

It can be written as a sum of positive squares in only one way, i.e., 1572519025 + 66774694464 = 39655^2 + 258408^2 .

It is not a de Polignac number, because 68347213489 - 2¹¹ = 68347211441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68347213409) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 130717 + ... + 392149.

It is an arithmetic number, because the mean of its divisors is an integer number (22782491641).

Almost surely, 2^68347213489 is an apocalyptic number.

68347213489 is the 261433-rd square number.

68347213489 is the 130717-th centered octagonal number.

It is an amenable number.

68347213489 is a deficient number, since it is larger than the sum of its proper divisors (261434).

68347213489 is an frugal number, since it uses more digits than its factorization.

68347213489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522866 (or 261433 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 55.

The spelling of 68347213489 in words is "sixty-eight billion, three hundred forty-seven million, two hundred thirteen thousand, four hundred eighty-nine".