68517959 has 4 divisors (see below), whose sum is σ = 68534760. Its totient is φ = 68501160.

The previous prime is 68517949. The next prime is 68517961. The reversal of 68517959 is 95971586.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 95971586 = 2 ⋅47985793.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68517959 is a prime.

It is a super-6 number, since 6×68517959⁶ (a number of 48 digits) contains 666666 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68517919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2057 + ... + 11885.

It is an arithmetic number, because the mean of its divisors is an integer number (17133690).

Almost surely, 2^68517959 is an apocalyptic number.

68517959 is a deficient number, since it is larger than the sum of its proper divisors (16801).

68517959 is an equidigital number, since it uses as much as digits as its factorization.

68517959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16800.

The product of its digits is 680400, while the sum is 50.

The square root of 68517959 is about 8277.5575503889. The cubic root of 68517959 is about 409.1992282251.

The spelling of 68517959 in words is "sixty-eight million, five hundred seventeen thousand, nine hundred fifty-nine".