68156666 has 8 divisors (see below), whose sum is σ = 102338964. Its totient is φ = 34043680.

The previous prime is 68156651. The next prime is 68156717. The reversal of 68156666 is 66665186.

It can be written as a sum of positive squares in 2 ways, for example, as 65529025 + 2627641 = 8095^2 + 1621^2 .

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

It is a super-2 number, since 2×68156666² = 9290662240471112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14795 + ... + 18846.

Almost surely, 2^68156666 is an apocalyptic number.

68156666 is a deficient number, since it is larger than the sum of its proper divisors (34182298).

68156666 is a wasteful number, since it uses less digits than its factorization.

68156666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34656.

The product of its digits is 311040, while the sum is 44.

The square root of 68156666 is about 8255.7050577161. The cubic root of 68156666 is about 408.4787288790.

The spelling of 68156666 in words is "sixty-eight million, one hundred fifty-six thousand, six hundred sixty-six".