68121679 has 2 divisors, whose sum is σ = 68121680. Its totient is φ = 68121678.

The previous prime is 68121649. The next prime is 68121701. The reversal of 68121679 is 97612186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68121679 - 2²¹ = 66024527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68121649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34060839 + 34060840.

It is an arithmetic number, because the mean of its divisors is an integer number (34060840).

Almost surely, 2^68121679 is an apocalyptic number.

68121679 is a deficient number, since it is larger than the sum of its proper divisors (1).

68121679 is an equidigital number, since it uses as much as digits as its factorization.

68121679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 68121679 is about 8253.5858267786. The cubic root of 68121679 is about 408.4088218435.

The spelling of 68121679 in words is "sixty-eight million, one hundred twenty-one thousand, six hundred seventy-nine".