68646757 has 2 divisors, whose sum is σ = 68646758. Its totient is φ = 68646756.

The previous prime is 68646749. The next prime is 68646761. The reversal of 68646757 is 75764686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39551521 + 29095236 = 6289^2 + 5394^2 .

It is a cyclic number.

It is not a de Polignac number, because 68646757 - 2³ = 68646749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68646757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68646797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34323378 + 34323379.

It is an arithmetic number, because the mean of its divisors is an integer number (34323379).

Almost surely, 2^68646757 is an apocalyptic number.

It is an amenable number.

68646757 is a deficient number, since it is larger than the sum of its proper divisors (1).

68646757 is an equidigital number, since it uses as much as digits as its factorization.

68646757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 49.

The square root of 68646757 is about 8285.3338496406. Note that the first 3 decimals coincide. The cubic root of 68646757 is about 409.4554678717.

The spelling of 68646757 in words is "sixty-eight million, six hundred forty-six thousand, seven hundred fifty-seven".