668783412533 has 2 divisors, whose sum is σ = 668783412534. Its totient is φ = 668783412532.

The previous prime is 668783412511. The next prime is 668783412541. The reversal of 668783412533 is 335214387866.

668783412533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360117609604 + 308665802929 = 600098^2 + 555577^2 .

It is a cyclic number.

It is not a de Polignac number, because 668783412533 - 2⁸ = 668783412277 is a prime.

It is a super-2 number, since 2×668783412533² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668783412553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334391706266 + 334391706267.

It is an arithmetic number, because the mean of its divisors is an integer number (334391706267).

Almost surely, 2^668783412533 is an apocalyptic number.

It is an amenable number.

668783412533 is a deficient number, since it is larger than the sum of its proper divisors (1).

668783412533 is an equidigital number, since it uses as much as digits as its factorization.

668783412533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 56.

The spelling of 668783412533 in words is "six hundred sixty-eight billion, seven hundred eighty-three million, four hundred twelve thousand, five hundred thirty-three".