68580821 has 2 divisors, whose sum is σ = 68580822. Its totient is φ = 68580820.

The previous prime is 68580803. The next prime is 68580851. The reversal of 68580821 is 12808586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46771921 + 21808900 = 6839^2 + 4670^2 .

It is a cyclic number.

It is not a de Polignac number, because 68580821 - 2¹⁴ = 68564437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68580851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34290410 + 34290411.

It is an arithmetic number, because the mean of its divisors is an integer number (34290411).

Almost surely, 2^68580821 is an apocalyptic number.

It is an amenable number.

68580821 is a deficient number, since it is larger than the sum of its proper divisors (1).

68580821 is an equidigital number, since it uses as much as digits as its factorization.

68580821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 68580821 is about 8281.3538144436. The cubic root of 68580821 is about 409.3243303136.

The spelling of 68580821 in words is "sixty-eight million, five hundred eighty thousand, eight hundred twenty-one".