699908806669 has 2 divisors, whose sum is σ = 699908806670. Its totient is φ = 699908806668.

The previous prime is 699908806651. The next prime is 699908806679. The reversal of 699908806669 is 966608809996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 583260601225 + 116648205444 = 763715^2 + 341538^2 .

It is a cyclic number.

It is not a de Polignac number, because 699908806669 - 2¹⁷ = 699908675597 is a prime.

It is a super-2 number, since 2×699908806669² (a number of 24 digits) contains 22 as substring.

699908806669 is a strobogrammatic number because it is the same when read upside-down.

It is a junction number, because it is equal to n+sod(n) for n = 699908806595 and 699908806604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (699908806679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349954403334 + 349954403335.

It is an arithmetic number, because the mean of its divisors is an integer number (349954403335).

Almost surely, 2^699908806669 is an apocalyptic number.

It is an amenable number.

699908806669 is a deficient number, since it is larger than the sum of its proper divisors (1).

699908806669 is an equidigital number, since it uses as much as digits as its factorization.

699908806669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544195584, while the sum is 76.

The spelling of 699908806669 in words is "six hundred ninety-nine billion, nine hundred eight million, eight hundred six thousand, six hundred sixty-nine".