668712849851 has 2 divisors, whose sum is σ = 668712849852. Its totient is φ = 668712849850.

The previous prime is 668712849797. The next prime is 668712849863. The reversal of 668712849851 is 158948217866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668712849851 - 2²² = 668708655547 is a prime.

It is a super-3 number, since 3×668712849851³ (a number of 36 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (668712809851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334356424925 + 334356424926.

It is an arithmetic number, because the mean of its divisors is an integer number (334356424926).

Almost surely, 2^668712849851 is an apocalyptic number.

668712849851 is a deficient number, since it is larger than the sum of its proper divisors (1).

668712849851 is an equidigital number, since it uses as much as digits as its factorization.

668712849851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46448640, while the sum is 65.

The spelling of 668712849851 in words is "six hundred sixty-eight billion, seven hundred twelve million, eight hundred forty-nine thousand, eight hundred fifty-one".