68256561 has 8 divisors (see below), whose sum is σ = 91067680. Its totient is φ = 45474912.

The previous prime is 68256557. The next prime is 68256577. The reversal of 68256561 is 16565286.

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

It is not a de Polignac number, because 68256561 - 2² = 68256557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68256521) 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, 1231 + ... + 11748.

It is an arithmetic number, because the mean of its divisors is an integer number (11383460).

Almost surely, 2^68256561 is an apocalyptic number.

It is an amenable number.

68256561 is a deficient number, since it is larger than the sum of its proper divisors (22811119).

68256561 is a wasteful number, since it uses less digits than its factorization.

68256561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14735.

The product of its digits is 86400, while the sum is 39.

The square root of 68256561 is about 8261.7529011706. The cubic root of 68256561 is about 408.6781961051.

The spelling of 68256561 in words is "sixty-eight million, two hundred fifty-six thousand, five hundred sixty-one".