668227647 has 16 divisors (see below), whose sum is σ = 911547648. Its totient is φ = 435308160.

The previous prime is 668227643. The next prime is 668227667. The reversal of 668227647 is 746722866.

It is not a de Polignac number, because 668227647 - 2² = 668227643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668227596 and 668227605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668227643) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10188 + ... + 37950.

It is an arithmetic number, because the mean of its divisors is an integer number (56971728).

Almost surely, 2^668227647 is an apocalyptic number.

668227647 is a deficient number, since it is larger than the sum of its proper divisors (243320001).

668227647 is a wasteful number, since it uses less digits than its factorization.

668227647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27950.

The product of its digits is 1354752, while the sum is 48.

The square root of 668227647 is about 25850.0995549340. The cubic root of 668227647 is about 874.2617542354.

The spelling of 668227647 in words is "six hundred sixty-eight million, two hundred twenty-seven thousand, six hundred forty-seven".