68256655 has 4 divisors (see below), whose sum is σ = 81907992. Its totient is φ = 54605320.

The previous prime is 68256647. The next prime is 68256659. The reversal of 68256655 is 55665286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55665286 = 2 ⋅27832643.

It is not a de Polignac number, because 68256655 - 2³ = 68256647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68256659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6825661 + ... + 6825670.

It is an arithmetic number, because the mean of its divisors is an integer number (20476998).

Almost surely, 2^68256655 is an apocalyptic number.

68256655 is a deficient number, since it is larger than the sum of its proper divisors (13651337).

68256655 is a wasteful number, since it uses less digits than its factorization.

68256655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13651336.

The product of its digits is 432000, while the sum is 43.

The square root of 68256655 is about 8261.7585900340. The cubic root of 68256655 is about 408.6783837097.

The spelling of 68256655 in words is "sixty-eight million, two hundred fifty-six thousand, six hundred fifty-five".