68155442 has 4 divisors (see below), whose sum is σ = 102233166. Its totient is φ = 34077720.

The previous prime is 68155429. The next prime is 68155447. The reversal of 68155442 is 24455186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 67092481 + 1062961 = 8191^2 + 1031^2 .

It is not an unprimeable number, because it can be changed into a prime (68155447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17038859 + ... + 17038862.

Almost surely, 2^68155442 is an apocalyptic number.

68155442 is a deficient number, since it is larger than the sum of its proper divisors (34077724).

68155442 is a wasteful number, since it uses less digits than its factorization.

68155442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34077723.

The product of its digits is 38400, while the sum is 35.

The square root of 68155442 is about 8255.6309268281. The cubic root of 68155442 is about 408.4762836256.

The spelling of 68155442 in words is "sixty-eight million, one hundred fifty-five thousand, four hundred forty-two".