68586487657 has 2 divisors, whose sum is σ = 68586487658. Its totient is φ = 68586487656.

The previous prime is 68586487649. The next prime is 68586487681. The reversal of 68586487657 is 75678468586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37828694016 + 30757793641 = 194496^2 + 175379^2 .

It is a cyclic number.

It is not a de Polignac number, because 68586487657 - 2³ = 68586487649 is a prime.

It is not a weakly prime, because it can be changed into another prime (68586407657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34293243828 + 34293243829.

It is an arithmetic number, because the mean of its divisors is an integer number (34293243829).

Almost surely, 2^68586487657 is an apocalyptic number.

It is an amenable number.

68586487657 is a deficient number, since it is larger than the sum of its proper divisors (1).

68586487657 is an equidigital number, since it uses as much as digits as its factorization.

68586487657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 541900800, while the sum is 70.

The spelling of 68586487657 in words is "sixty-eight billion, five hundred eighty-six million, four hundred eighty-seven thousand, six hundred fifty-seven".