668060851 has 2 divisors, whose sum is σ = 668060852. Its totient is φ = 668060850.

The previous prime is 668060839. The next prime is 668060923. The reversal of 668060851 is 158060866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668060851 - 2¹¹ = 668058803 is a prime.

It is not a weakly prime, because it can be changed into another prime (668060801) 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 as a sum of consecutive naturals, namely, 334030425 + 334030426.

It is an arithmetic number, because the mean of its divisors is an integer number (334030426).

Almost surely, 2^668060851 is an apocalyptic number.

668060851 is a deficient number, since it is larger than the sum of its proper divisors (1).

668060851 is an equidigital number, since it uses as much as digits as its factorization.

668060851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 668060851 is about 25846.8731377705. The cubic root of 668060851 is about 874.1890068222.

The spelling of 668060851 in words is "six hundred sixty-eight million, sixty thousand, eight hundred fifty-one".