68691907 has 2 divisors, whose sum is σ = 68691908. Its totient is φ = 68691906.

The previous prime is 68691881. The next prime is 68691911. The reversal of 68691907 is 70919686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68691907 is a prime.

It is not a weakly prime, because it can be changed into another prime (68691947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34345953 + 34345954.

It is an arithmetic number, because the mean of its divisors is an integer number (34345954).

Almost surely, 2^68691907 is an apocalyptic number.

68691907 is a deficient number, since it is larger than the sum of its proper divisors (1).

68691907 is an equidigital number, since it uses as much as digits as its factorization.

68691907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 68691907 is about 8288.0580958389. The cubic root of 68691907 is about 409.5452165291.

The spelling of 68691907 in words is "sixty-eight million, six hundred ninety-one thousand, nine hundred seven".