68221679 has 2 divisors, whose sum is σ = 68221680. Its totient is φ = 68221678.

The previous prime is 68221651. The next prime is 68221687. The reversal of 68221679 is 97612286.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68221679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68223679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34110839 + 34110840.

It is an arithmetic number, because the mean of its divisors is an integer number (34110840).

Almost surely, 2^68221679 is an apocalyptic number.

68221679 is a deficient number, since it is larger than the sum of its proper divisors (1).

68221679 is an equidigital number, since it uses as much as digits as its factorization.

68221679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 68221679 is about 8259.6415781800. The cubic root of 68221679 is about 408.6085669407.

The spelling of 68221679 in words is "sixty-eight million, two hundred twenty-one thousand, six hundred seventy-nine".