68666117257 has 8 divisors (see below), whose sum is σ = 71896152384. Its totient is φ = 65456461488.

The previous prime is 68666117237. The next prime is 68666117269. The reversal of 68666117257 is 75271166686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68666117257 - 2⁷ = 68666117129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68666117198 and 68666117207.

It is not an unprimeable number, because it can be changed into a prime (68666117237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5087943 + ... + 5101420.

It is an arithmetic number, because the mean of its divisors is an integer number (8987019048).

Almost surely, 2^68666117257 is an apocalyptic number.

It is an amenable number.

68666117257 is a deficient number, since it is larger than the sum of its proper divisors (3230035127).

68666117257 is a wasteful number, since it uses less digits than its factorization.

68666117257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10189679.

The product of its digits is 5080320, while the sum is 55.

The spelling of 68666117257 in words is "sixty-eight billion, six hundred sixty-six million, one hundred seventeen thousand, two hundred fifty-seven".