68380661 has 4 divisors (see below), whose sum is σ = 70048524. Its totient is φ = 66712800.

The previous prime is 68380657. The next prime is 68380687. The reversal of 68380661 is 16608386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16608386 = 2 ⋅8304193.

It can be written as a sum of positive squares in 2 ways, for example, as 38514436 + 29866225 = 6206^2 + 5465^2 .

It is a cyclic number.

It is not a de Polignac number, because 68380661 - 2² = 68380657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68380651) 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, 833870 + ... + 833951.

It is an arithmetic number, because the mean of its divisors is an integer number (17512131).

Almost surely, 2^68380661 is an apocalyptic number.

It is an amenable number.

68380661 is a deficient number, since it is larger than the sum of its proper divisors (1667863).

68380661 is a wasteful number, since it uses less digits than its factorization.

68380661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667862.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 68380661 is about 8269.2600031684. The cubic root of 68380661 is about 408.9257242428.

The spelling of 68380661 in words is "sixty-eight million, three hundred eighty thousand, six hundred sixty-one".