68917657 has 2 divisors, whose sum is σ = 68917658. Its totient is φ = 68917656.

The previous prime is 68917633. The next prime is 68917661. The reversal of 68917657 is 75671986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67716441 + 1201216 = 8229^2 + 1096^2 .

It is a cyclic number.

It is not a de Polignac number, because 68917657 - 2⁷ = 68917529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68917657.

It is not a weakly prime, because it can be changed into another prime (68917687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34458828 + 34458829.

It is an arithmetic number, because the mean of its divisors is an integer number (34458829).

Almost surely, 2^68917657 is an apocalyptic number.

It is an amenable number.

68917657 is a deficient number, since it is larger than the sum of its proper divisors (1).

68917657 is an equidigital number, since it uses as much as digits as its factorization.

68917657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 49.

The square root of 68917657 is about 8301.6659171518. The cubic root of 68917657 is about 409.9933709021.

The spelling of 68917657 in words is "sixty-eight million, nine hundred seventeen thousand, six hundred fifty-seven".