668051256803 has 4 divisors (see below), whose sum is σ = 763487150640. Its totient is φ = 572615362968.

The previous prime is 668051256799. The next prime is 668051256811. The reversal of 668051256803 is 308652150866.

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

It is a cyclic number.

It is not a de Polignac number, because 668051256803 - 2² = 668051256799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668051256853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47717946908 + ... + 47717946921.

It is an arithmetic number, because the mean of its divisors is an integer number (190871787660).

Almost surely, 2^668051256803 is an apocalyptic number.

668051256803 is a deficient number, since it is larger than the sum of its proper divisors (95435893837).

668051256803 is an equidigital number, since it uses as much as digits as its factorization.

668051256803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95435893836.

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 668051256803 in words is "six hundred sixty-eight billion, fifty-one million, two hundred fifty-six thousand, eight hundred three".