68668617942409 has 9 divisors (see below), whose sum is σ = 68716921644237. Its totient is φ = 68620348188684.

The previous prime is 68668617942401. The next prime is 68668617942413. The reversal of 68668617942409 is 90424971686686.

The square root of 68668617942409 is 8286653.

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

It is not a de Polignac number, because 68668617942409 - 2³ = 68668617942401 is a prime.

It is a super-3 number, since 3×68668617942409³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68668617942401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20443171272 + ... + 20443174630.

Almost surely, 2^{68668617942409} is an apocalyptic number.

68668617942409 is the 8286653-rd square number.

68668617942409 is the 4143327-th centered octagonal number.

It is an amenable number.

68668617942409 is a deficient number, since it is larger than the sum of its proper divisors (48303701828).

68668617942409 is an frugal number, since it uses more digits than its factorization.

68668617942409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11652 (or 5826 counting only the distinct ones).

The product of its (nonzero) digits is 1504935936, while the sum is 76.

The spelling of 68668617942409 in words is "sixty-eight trillion, six hundred sixty-eight billion, six hundred seventeen million, nine hundred forty-two thousand, four hundred nine".