668531135869 has 2 divisors, whose sum is σ = 668531135870. Its totient is φ = 668531135868.

The previous prime is 668531135821. The next prime is 668531135873. The reversal of 668531135869 is 968531135866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639900803844 + 28630332025 = 799938^2 + 169205^2 .

It is a cyclic number.

It is not a de Polignac number, because 668531135869 - 2¹⁷ = 668531004797 is a prime.

It is a super-3 number, since 3×668531135869³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668531175869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334265567934 + 334265567935.

It is an arithmetic number, because the mean of its divisors is an integer number (334265567935).

Almost surely, 2^668531135869 is an apocalyptic number.

It is an amenable number.

668531135869 is a deficient number, since it is larger than the sum of its proper divisors (1).

668531135869 is an equidigital number, since it uses as much as digits as its factorization.

668531135869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27993600, while the sum is 61.

The spelling of 668531135869 in words is "six hundred sixty-eight billion, five hundred thirty-one million, one hundred thirty-five thousand, eight hundred sixty-nine".