68071957 has 2 divisors, whose sum is σ = 68071958. Its totient is φ = 68071956.

The previous prime is 68071943. The next prime is 68071987. The reversal of 68071957 is 75917086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63345681 + 4726276 = 7959^2 + 2174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68071957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68071907) 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, 34035978 + 34035979.

It is an arithmetic number, because the mean of its divisors is an integer number (34035979).

Almost surely, 2^68071957 is an apocalyptic number.

It is an amenable number.

68071957 is a deficient number, since it is larger than the sum of its proper divisors (1).

68071957 is an equidigital number, since it uses as much as digits as its factorization.

68071957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 68071957 is about 8250.5731316073. The cubic root of 68071957 is about 408.3094318186.

The spelling of 68071957 in words is "sixty-eight million, seventy-one thousand, nine hundred fifty-seven".