688813412669 has 2 divisors, whose sum is σ = 688813412670. Its totient is φ = 688813412668.

The previous prime is 688813412641. The next prime is 688813412689. The reversal of 688813412669 is 966214318886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646721556100 + 42091856569 = 804190^2 + 205163^2 .

It is a cyclic number.

It is not a de Polignac number, because 688813412669 - 2¹² = 688813408573 is a prime.

It is a super-2 number, since 2×688813412669² (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 (688813412689) 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, 344406706334 + 344406706335.

It is an arithmetic number, because the mean of its divisors is an integer number (344406706335).

Almost surely, 2^688813412669 is an apocalyptic number.

It is an amenable number.

688813412669 is a deficient number, since it is larger than the sum of its proper divisors (1).

688813412669 is an equidigital number, since it uses as much as digits as its factorization.

688813412669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23887872, while the sum is 62.

The spelling of 688813412669 in words is "six hundred eighty-eight billion, eight hundred thirteen million, four hundred twelve thousand, six hundred sixty-nine".