68666819 has 8 divisors (see below), whose sum is σ = 74277840. Its totient is φ = 63102816.

The previous prime is 68666803. The next prime is 68666821. The reversal of 68666819 is 91866686.

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

It is a cyclic number.

It is not a de Polignac number, because 68666819 - 2⁴ = 68666803 is a prime.

It is a super-2 number, since 2×68666819² = 9430264063157522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68666849) 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 in 7 ways as a sum of consecutive naturals, for example, 8684 + ... + 14585.

It is an arithmetic number, because the mean of its divisors is an integer number (9284730).

Almost surely, 2^68666819 is an apocalyptic number.

68666819 is a deficient number, since it is larger than the sum of its proper divisors (5611021).

68666819 is a wasteful number, since it uses less digits than its factorization.

68666819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23509.

The product of its digits is 746496, while the sum is 50.

The square root of 68666819 is about 8286.5444547169. The cubic root of 68666819 is about 409.4953517442.

The spelling of 68666819 in words is "sixty-eight million, six hundred sixty-six thousand, eight hundred nineteen".